i find it interesting that people all harp on ponzi sites for being scams/running with peoples money. at the end of the day, any of these questionable btc gambling websites fit one of two models:
1)the house odds are so great that they should never endure any great deficit of BTC (i.e. you will never make money in the long run - see any dice website, despite what some people will tell you)
2)you have the possibility of actually turning a profit, but if your timing is wrong, the site owner will not go in debt on moral grounds, so once the deficit overcomes the cash flow inwards, the site collapses (i.e. ponzi scheme, but also any other bitcoin game that has healthy odds including minesweepers, etc)
at the end of the day it comes down to either a risk against the house, or a risk against other gamblers. but to jump on a bandwagon and denounce ponzis based on these facts doesn't seem right, as they are not really any different from anyone else. nobody seems to shake a finger at the big dice sites, even though they are maintaining a healthy cut across the board. and noone truly believes that a site like minesweeper would keep paying out if they endured a ton of player wins, they would shut the site down all the same.
Bitcoin or not, obviously casinos are not charities and the house has to keep winning in order to run the place. That doesn't mean that a minority of the people there don't end up profiting.
For me, gambling is just a hobby. I do it to have fun, and slots are my favorite. If I were a serious gambler only interested in the profiting aspect, I'd probably look at sports betting or even poker.