My question to you "Can a person beat the edge with a large enough bank roll?"
No. As the moderator of a gambling site, you should know this.Congrats to N8snathan for his win! Should have cashed out my investment when I was up 0.01+BTC, but unfortunately it's down 0.02BTC now. Hopefully he stays around and ends up losing more than he wins.
Damn! What a great win, I bet the casino was fuming 
Congratulations to the winning gambler though, I hope he enjoys the big win.
Nah, BitVest was probably very happy. Nathan brought a lot of volume to the site, causing a lot of commission to be taken from investors (mine is 0.01BTC). While they probably had an investment, they were probably happier to see a winner as it's good PR and they would still be in profit or have a small loss in that period of time.Congratulations to the winning gambler though, I hope he enjoys the big win.