Can anyone tell me if we are supposed to get a reward after each car collector level up? I think I was last week, but I am not getting anything anymore. It is possible I’m just not remembering correctly… can someone please verify ?
No not for car collection tier level ups.
You do get to pick rewards in driver level up.
Ok, so what’s the point if the car collection tier? It says to improve your rewards, but I don’t see them improving, or am I looking in the wrong places? 
I’ve been stuck at 50k reward & 400k discount for ages.
you aren’t stuck, that’s the limit, it doesn’t get any higher