They do have this. It's called "bike angels", and it lets you earn points based on how empty or full a station is. They also have bonuses on special holidays or rainy days.

Sounded interesting, so I looked it up - https://bikeangels.citibikenyc.com/ - seems like a well designed incentive system.

In London they have teams of people unloading truckloads of bikes to places where all the lots are empty. I don't know how cost effective it is but it seems to be working pretty well

same here, but it's nice to know you're needed.

Citi Bikes already does this.

impressed. sorry i don't live in NYC, we just have a similar system here.