Would anyone be interested in investment pos coins to be added. If so you could do wallets that stake for us here so we have a side income for bets, but most are crap coins unfortunately.
Things like scratch tickets can be done like a touch the area's see if you win. Pull ticket both for instant lottery and a daily and weekly draw for progressives.
Raining the daily and weekly draw tickets would be great fun too.
If they add pos coins the wallets could be used for staking and building interest. The only problem is not to sure which coins would be worth staking and there would have to be a percentage of the staking to the site for the wallet storage.