Eventually you will lose, thats the whole thing with gambling...the house has the edge in the long run.
For sites like that I try to allow myself a buffer of about 15 loses in a row while double up every bet. You can and eventually still will lose (ive seen cases of 30 loses in a row but heard of more) but with that amount of buffer you can last quite awhile usually and cash out every so often.
Most I've ever been up at freebitco.in is 0.04000000 but lost it all after a night of drinking and getting greedy
