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.
it does look simple, but I do not think you would do it, you know it is at risk. You can lose a lot of money in just one click.
could only laugh that you said it was Very easy and fun

, really a bad idea!