If you don't want to go trough all faucets from micropayment services, you can check my site:
http://bitcoins4free.altervista.org/bitcoin-faucets/.
Here is the link of my TOP faucets list. There you can find only my favourite faucets which gives biggest rewards and mostly these faucets have additional things to earn more satoshi.

It's a good thing for website and referer. Referer receives commission (earnings) from referrals, website gets more visitors/users.
There are also some bads things in this case, like joining site through your own referral link.
And it can be quite hard to get many referrals, because sometimes you need to do lot of job to promote your referral link.

If you have private keys of wallet, congratulations, bitcoin is yours. You have the right to take these bitcoins, you are really lucky.
This address isn't used since 2011, I think owner from the first wave of bitcoin users and he isn't in bitcoin world anymore. But it's really strange that private keys was published on internet and nobody taked these bitcoins until now.

First of all, don't be lazy and do some research by yourself, it's really not hard to find right information about signature campaigns. Secondly, you need to have some knowledge about bitcoin if you want to join signature campaign and get bitcoins for your posting. I recommend to read some articles, bitcoin wiki andother sources to learn about bitcoin. And also, you need to reach jr. member rank to join signature campaign.

It's quite safe to use few most popular bitcoin wallets, but it's not recommend to use it as your main wallet. It would be best and most secure to hold biggest part of your bitcoins on desktop or hardware wallet. You can keep bitcoins in web wallet to use it for your daily needs. And if you want to use web wallet, choose wallet which gives access to your private keys.

I'm in bitcoin world for more than two years now, but it's still like rocket science for me. It's hard to understand lot of technical details of bitcoin, blokchain, mining process and so on. But I don't think that I need to have deep knowledge about bitcoin, I'm only one of average users of bitcoin.
When I was newbie, I was worried that bitcoin isn't used friendly technology. I was thinking that bitcoin have only one official wallet - bitcoin core, which uses lot of computer resources. But later on bitcoin.org found some user-friendly wallets and finally I started my bitcoin journey.

Offcourse it's possible, as others already said. Personally, I have never tried to do it. And I don't understand point of it. If these addresses are connected to your wallet, you have one main ballance. If you send coins from wallet to address D, you will only need to pay transaction fee, but your coins will remain on your main ballance.

There are many ways how to get referrals.
1) You can create advertisement campaign on bitcoin ad networks like a-ads. It's cheap and effective way to get referrals.
2) Create advertisements on PTC websites like Neobux or Clixense. It's also cheap way to get referrals, but not very effectiv. Many people will only open your ad and will close it when timer expires.
3) Promote your link with informative description on various forums. It's free and effective way to get referrals. But some forums don't allow ref links and it can be deleted as spam.
4) Promote your link on Facebook pages and groups. But you will need to create lot of spam to get some referrals, because post reach isn't big
5) Create free website or blog, write article about Hashflare, explain why people should you this company.

100 million forum members, I think it's only theorical thing. Until now, bitcointalk have less than million registered users, and half of these users didn't made single post. I predict that real number of active bitcointalk users is around 100k people.
If bitcoin community will grow, it doesn't means that all these people will use bitcointalk. Not everyone is interested in discussions, signature campaign, spamming, ranting and etc. They only will use bitcoin as a currency.
But if forum community will grow, bitcointalk will need for more staff to control everything.

I'm not living in USA and I don't follow their news media, so I can't answer this poll. But I think this poll is pointless. Why? Because this poll is created on Trump official website and it's obvious that it will be answered by Trump supporters. I think that Trump exaggerates negative media treatment to him and so called fake news.

Simple faucet with high rewsrd and instant payments to Xapo. I never saw faucet hosted on weebly earlier. And I don't recommend to use Weebly for faucet. I earlier had faucet list/money earning site on weebly and I was banned. They don't allow any online money earning sites - faucets, ptc, investments sites and etc.

There are few companies which allow to pay for flight tickets with bitcoin. I have never tried to pay for flight tickets with bitcoin. As I know Cheapair is old and popular company. Abitsky accepts only bitcoins for the payment. Don't know much about Destinia, users reviews isn't very good.
cheapair.com, abitsky.com, destinia.com

Why do you think Coinbase isn't a good place to buy bitcoin? It's good place to buy bitcoins. Offcourse, they can ask for identity verification, but many exchanges can ask for it.
But if you don't want to use Coinbase, there are many alternatives for you - Paxful, Cex.io, Exmo, Spectrocoin, Bitstamp and many more. You can check all available exchanges in your country there:
https://www.bitcoin.com/buy-bitcoin?country=GB

I keep my bitcoins divided into few online wallets. I know it's not safest place to keep bitcoins, especially if wallet don't gives your private keys, but I don't want to keep bitcoins on desktop wallet because I'm afraid to catch virus, which can steal my coins. I also keep some bitcoins in few exchanges for trading. But it's only small amount, keeping all bitcoins on exchanges is not recommended. I think safest place to keep bitcoins is hardware wallet like Trezor, but it costs quite expensive.

I don't think that bitcoin can become boring. First of all, bitcoin price isn't stable and it won't become stable soon. Price factor is one of the reasons why bitcoin isn't boring.
Also, bitcoin have to be used by everyone and accepted everywhere to become boring thing. I don't think it's possible.
And maybe, centralization of bitcoin can make it to boring and usual thing.

It looks that this site isn't updated, because I see there many faucets which is closed or don't pay anymore. If you are looking for good list of faucets, you can try my website :
http://bitcoins4free.altervista.org/ there you can find more than 300 legit faucets.

Minimal reward which would satisfy me would be 50 satoshi. Lowest % of ref commission for me is 10%, but optimal commission is 20%.
Your planned payment rates looks nice. But I think it can be to hard to keep high rewards on long timer faucets. I don't see many faucets these days which gives 250-450 satoshi in single claim.
I also don't understand this thing - if payment goes directly to epay, about what converting to usd and transfering to ptc ballance you are talking? Can you explain?

Some faucets which use JQuery faucet script have option to withdraw fund to Xapo or Faucethub without treshold. But as I understand, it's not what you are looking for.
I never saw Xapo faucet which have option to check ballance for non-Xapo users. As I remember, forum member Gifted tried to implement this function.
You can try to contact him:
https://bitcointalk.org/index.php?action=profile;u=535716

I didn't faced similar issues today. Coinbase website and mobile app works fine for me. It looks that problem can be at your side. Maybe try to open Coinbase on differnt browser, or try to clean browser cookies.

Altcoin faucets isn't very popular, it means small earnings from advertisements. But good part of altcoin faucets that there are less bots and fraudsters who are trying to steal coins from faucet.
I saw that some faucet owners said that simple faucets (enter btc address, solve captcha, receive coins) have no future. They have to offer to users something more - faucet based game, dice faucet and so on.