Very simple - start with 0.5 BTC bet with 49.95% chance of win, double bet untill you win, and then withdraw. Very easy and fun.

It's not even easy at all since your staking your .5 with 50.05% of losing, you can barely double it. There's a high chance that you will lose all your funds before getting your money doubled.
well you are correct, but just one luck and its doubled and instant withdraw, don't play again for that day or week, enjoy the winnings. Just in my opinion, i like this kind of betting..YOLO.
You mean staking your hard earned money with one luck bet? And do the same thing again next week? Hell no. Doing that every week will most likely give you 2 out of 4 winnings so if you did win for 1st and 2nd then expect to lose in 3rd and all the money you earned in 1st and 2nd time of winning will just be sweep away for the 3rd bet.
I dont mean that, because i am really a gambler, thats why i like YOLO, but what i am doing is when i win the bet, for example 0.5, i withdraw the other 0.5 to cash and spend it, and then try the 0.5 left again, if it loose, still i dont loose anything, when it wins. just do it again.haha