Maybe make it to where there is an npc like the one for smuggling, yet this npc gives you a set job, he marks the type of car he needs you to steal and bring back to him. It will give you a timer to get it and if you fail you don't get the money for bringing him the car. This could be a good crimerp thing. And this would give reason for stealing cars. And when the car is stolen from the player, what should happen is, the player will have to get it repaired for 3x as much as you normally would do, seeing as how you just had parts ripped from the car to say. I have seen other perp servers do this, it is really fun to do this, the car that has been stolen will be ditched somewhere random on the map maybe, or just disappear.