A huge fluctuation in the past was caused because of some reasons and I could only think about the shutdown of Gox. Gox was handling about 75% of all bitcoin transaction and when it shutdown, you can guess what happened which caused the downfall of bitcoin's value to what it was.

Gambling is not for the 'not wise' since gambling either requires pure luck, or there is a system/technique to beat the game. That's all there is to it.
If not however, gambling is just like any other game, except that there is money involved. It's supposed to be fun and entertainment.

I never knew you could use gift cards as payment in localbitcoins. I'm usually only offerd either on-hand payments, cash delivery, bank transfers, or paypal. I guess geographical preferences? I don't know. Either way, I get most of my coins from localbitcoins too and about 20% from signature campaigns.

Knowing about bitcoin's decentralized nature would only disallow the cooperation of banks with bitcoin wallets, unless banks decide to not control it at all. But would you still be able to call it a 'bank'?

Rise does not really mean more people using but it kinda does affect the number of people using it indirectly and it is right that there is not really a way to determine the actual number of people using.

Yes, when luck is the only deciding factor, then loss are always inevitable. The long run is just required to ensure no gambler is escaping from being losers. Ironically most of the gamblers are becoming losers in the beginning days itself.

Why you will not accept. If I am in your place like having more expertise in bitcoin trading then also I will accept 10 BTC if anyone offered me at free of any employment. But I will not trade or gamble with my free money, as I am worshipping it as a good fortune. So, I will save it in cold storage for my better future.

Well it might still be considered stealing, since he has accidentally overlapped an address that contains bitcoins, and those aren't his either so technically, that is indeed stealing. However, he isn't to be blamed for such an event to happen.

I believe investing in altcoins can be considered a source of income in bitcoins under 'investments' since you can just swap those alts for bitcoins after a good amount of time and gaining enough profit from it. ( Still, I am not recommending investing into altcoins. Act on your own responsibility.)

Renting a warehouse however might come with a high cost and that might affect your ROI from mining but nevertheless, 4BTC isn't really going to cut it since you'd have to pay for electricity fees and other utility fees.
Having an antminer S9 already costs about 3.7BTC.

Some people are just too stupid to think that bitcoin has nothing to do with the nature of the business or transaction done. They would just immediately conclude that bitcoin is evil just because some people have done illegal things that had bitcoins involved.

Bitcoin really isn't to be blamed for such illegal activities done with it. Rather, it's the sellers and the buyers, or basically every single person involved in that certain transaction is to be blamed. It's not like bitcoin was purposely made for it but it was those people who had the thought of using bitcoins to do their crimes.

Yes, gambling is just an entertainment, it will never impact in any gambler's life in a positive way. But it will impact in negative way a lot due to the consequence of gambling losses. As you said, many gamblers got their life wrecked due to gambling losses but very rarely we hear about the player's success with a gambling and got his life fixed due to his gambling profits.

Not just some merchants, but even the 'bigs' are accepting bitcoins as payment now a days.
Notable mentions are Samsung and Microsoft. Steam as well, I believe it deserves a mention in this. Very sooner we are going to use the term "everywhere" for bitcoin as a method of payment online.

I do not know that how much time will bitcoin take to skyrocket, but I have some bitcoins in my wallet and I will wait for an year or two and then I will start a small business with 25% of bitcoins. Rest of bitcoins will be sleeping in cold storage for the purpose of using in my retirement life.

Yeah, earning money with signature campaign is really interesting, with that you will visit a number of topics and will discuss about bitcoin and with that discussion you will get some money. The best part with the signature campaign is you are gaining knowledge as well as bitcoin, which is simply incredible.

Are you pointing for ponzi sites?
I think he should have to stay away from the schemes like that, it is his hard earned money and if he gone there, then not sure that he will get that amount back or not. Because ponzi sites are worst than gambling or throwing out. Once invested, gone for ever.

My best way of steady income with the respect to my country is bank deposits.

I heard about negative interests in some countries. But in my country, we have the options to get interest being credited to our savings account even on monthly basis. So, it is almost equal to getting salary. More the saving and deposit amounts, more the interest as a salary for our luxurious life.
Our deposit amount is guaranteed by the central reserve bank and government.

There were history even gold collapsed more than 40% also. All the investments are vulnerable to ups and downs and there is no exceptions with both bitcoin and gold. With the respect to modern thinking and digital era demands, bitcoin has more prospectus future compared to gold.

Even it seems a very big amount for any common people, but I believe it is possible to have that much worth of bitcoins in some days by keep on saving all my income with bitcoins. With respect to current bitcoin price, anyone must have only very short time to have 21 bitcoins unless having a consistent and enormous bitcoin earning source.