Actually a casino isn't about "spectacular jackpots", but it's about not being able to predict the size or time of the jackpot. When you spread the winnings around you actually make it even more like a slot machine rather than like a lottery. Since in either case of a slot machine or lottery there is no guaranteed win, it's like a casino regardless.

Steemit can only operate like a casino unless everyone is guaranteed a proportionate payout and in that case it becomes like a regular salary.