How I think this would work is kind of like chop shop. You go to a unmarked location and talk to a npc and he gives you a list with cars he wants with 1-2 priority cars which he would pay extra money for and a location to search for the car. Also your pay would be lowered if you damage the vehicle. I think to balance this you could have part of the pay be dependent of how far away the location he gives you is. Also if you keep stealing cars for this guy he could slowly pay you a little bit more money. I think this would be a good addition to the server because it would add a new fun crime which would make pretty decent money.