You are right, that's why I'm withdrawing regularly, taking advantage of the lucky runs.
I played again for a while. Got nothing to bet with, and decided to try the roulette again, and got lucky one more time. I went from the 0.6 to 1 BTC xD
I requested to withdraw another 0.5 BTC, and will keep playing with the rest.
I will try to keep it mostly on bets, since I want to see if I can make decent wins on bets, and will go to the roulette from time to time.
Right, the important thing to remember is not, repeat, not to get into the mindset that you can recover from a large loss. It's going to happen (it always does, eventually) where you buy in with, say, your half BTC and you get unlucky. Since you're already way into the black, just accept that loss and come back another day. If you chase that loss, most likely you'll end up in the red. That's my advice and congrats on the big wins.