I'll give a clue - it's something that has required significant monetary investment on my part (I'm talking 5 figures US$) before I can offer it to users. I'll reset the 24 hr limit for the users who posted before. You guys can guess again.
I don't think it's very likely, but the only thing I can come up with (since it's not leaderboard or loyalty points or shares in profit) is cloudmining (Bitcoin, or altcoins), in which users earn (dilutive?) shares for every roll/referral roll/dice wager.