I have over 300 vehicles in my line-ups. Most of the time it seems like the server has issues loading my paid-for camos in matches. Ill see the camo in the garage, but its like I have so many market place camos that the server cant remember to load it in matches, unless randomly it does. Then it most of the time stays loaded. If I move to a new line-up the camos have issues again.
I paid for these, and most of the time no one sees the camo. I play with my family including my wife so we enjoy customizing our tanks and seeing them in battle.