An installer to play is probably a good way to not get many people trying or rating it.
I gave out $100,000, am I doing it right?
Win or lose, trying to keep them on the line doesn't seem very useful. There's no reason not to just keep giving 0 and more come by and you repeat. It's also really hard not to scare them off, I'm not sure what the logic is in it. Even small winnings or losing seems to run them off.
It's a neat idea though.