Well, you guys were right. I ended up losing it all in a couple big bets, then I got back up to 30 BTC before losing most of it with the martingale strategy. Now I'm at zero. It's a weird feeling, to go from $0 to making $1000, then back to zero in a few days. Maybe I'll try Satoshi's dice again, but I've learned to quit while on top, since it's incredibly easy to lose massive sums of bitcoins QUICK.

I guess I just answered my original question. This is how the site stays afloat.