If there is some monetary incentive for them to do this, you've not outlined who is paying it to them. And even if it exists, that's the problem, not the up front incentives.
Secondly, OP is subtracting the $2,500 rebate from the car payments he's making, so the manufacturer is actually getting ~$6k instead of $3k, which is a significant chunk of the difference between residual and current resale value.
Yes it does, you're just a variable: California requires car companies to sell a certain number of EVs in order to sell other cars in the state.
So companies take their cheapest model, convert it into a passable EV, then their financing arm offers nice incentives to get them out the door and the parent company eats the difference as a cost of doing business in California.
People buy teslas, leafs, i3s everything in my northwest state and we don't have a state rebate or requirement like California. Leafs were ~$250/month here. You see tons of them; when they increase the range a bit, I predict sales will really go up.