@gabriel @sun weighted probabilities on a timer with both grind to skip and pay to skip seems to be the preferred option

The thing you grind or pay for gets you a pull, pulls spin the wheel. The wheel drop rates must be abysmal or people won't do it.

I would also wager that there has been research done to come up with heuristics that fake probability but actually just edge you up and down to control neurotransmitter responses.

I have some guesses but maybe you should think of the reward algorithm more like the yt recommendation algorithm, not like a dice roll. That's probably more effective at maximizing addictive responses.