I don't think mining being less profitable would end bitcoins, it still is for those mining in big quantity and I don't see that as a bad thing in general, also the price will increase and compensate for the decrease in return with the mining.

Earning just a small amount of BTC from promotion and being an affilate, around 0.03 BTC and sometimes it increases or decreases as well.. Aiming to increase it and getting better domains and increase my profit.

There are few methods to get a big profit on the invested money, You can try trading BTC for USD and altcoins as well as investing in the bankroll of gambling websites or sites or even gambling but all of these are risky money investments "especially gambling of course".

I would keep it all in cold storage "if the total volume was 1-2 BTC I would trade it against fiat for profit but for a total of 21 BTC I would just keep it offline" and waiting for a price increase as occurred multiple times with bitcoin.

I seen few of people earning a living with bitcoins in this forum, Some like Stunna and dooglus as well as Vod and few other members, As well as those running exchanges "And the full exchange staff", Gambling website operators and staff as well.

I just use it as an investment and spend some of my salary in it, I use it mostly to buy games online, Currently have around 0.4 BTC's  I do agree people shouldn't invest big sums in it since it's pretty volatile.

I'm with using Bitcoin wallets IMO, it's cheaper, easier and more convenient plus it's a decentralized method therefore more with the concepts of bitcoin like anonymity and the privacy it offers more than a bank with your information linked to the account.

The main reason I bought Bitcoin is it is a good investment IMO. Other than that, I use it to purchase goods from online store/websites and getting good discounts from it. I rarely use it to buy altcoins and speculate with BTC price.

if BTC is at that limit anytime soon then everyone in this forum would probably be millionaire or at least very rich in there countries  , I would sell half of my bitcents and keep the rest for a price increase  .

if it was an option, I would take around 30% or so of it in BTC, that would save the time of trying to sign and exchange it for BTC. I wouldn't take all my salary in BTC since you can't use it to buy items directly with it and need to exchange it for BTC.

I rarely convert my BTC to fiat and I don't have that much anyway, I do use BTC to buy games, codes and other online choices and options. I use BTC whenever I get the chance but never was able to buy something in the real world physically with it.

Mostly for fun and barely profit and since it's just a low profit possibility with the house edge against the player therefore it's just mostly for fun, it's a bad hobby though IMO and hard to leave when you want to, Definitely the best choice to spend time.

In today's games I think I like: Nancy - PSG: PSG ML The odds aren't great but PSG has a big chance in winning the match IMO, Over 2.5 might also be a good pick.
Guingamp - Lille: Lille ML

Chelsea vs Leicester City: Over 2.5
Arsenal vs Swansea City: I like Arsenal ML and that's relatively possible considering the place and the total performance of the team "Arsenal" in the previous 2 weeks.
Man City vs Everton: Man city, I think they will bounce back, Good team and the odds are decent.

I don't know about SV Werder scoring.. There matches in general had few goals but I don't know if they can score against BL Defense, My pick for today is Bayern winning but the price is pretty low considering the possible risk IMO.

The long confirmation time is probably the thing I like the least, it can sometimes take up to 20 to 30 minutes on average to get the first confirmation and some sites even require the first confirmation before crediting or confirming the deposit.

You do pay more fees using CC on the long term, You don't pay direct fees for some cards in the US but the interest on the used funds can be much more than 5 cents, Also PayPal "for example" takes +30 cents and a 2.something fee for each commercial transaction, BTC is cheap compared to that.

By common sense stealing anything is illegal therefore stealing bitcoin is illegal as well IMO, I think in some countries it's considered a commodity therefore still illegal by the rules in the most of the world, I doubt it's legal anywhere though.

Depending on how long and the profit you are aiming for, gold is not better than the bitcoin in speed/size of potential profit because with gold it take ages to make profit and with the bitcoin you can make such nice profits if you ask me on a short and long term period but BTC is a more risky money investment than gold.

I use three different wallets and I think it depends on how quick and how secure you want your wallet, I use core, Electrum and Multibit and Each has it's own advantage regarding how quick, or safe it is, Multibit is in between therefore the default wallet I use.