So, we can't buy anything in game with real money due to law issues.
How about this one, dear devs and players:
We pay up for goodies with fan-made content, like frame art, critters, 3D models or sprites.
You want a new car? Model, render and make a frame of it. Get one free in game.
You want some spare caps from GM's? Draw some rocks or a short set of frames. (not complete animations)
A new location? Map a good one and get it in-game!
The tutorials how to do it are on NMA, grab them, make a agreement with a developer, what you want to do and start creating.