Okay, why would I spend 100-200 tokens a pop to colour an item when I can just go into GIMP and make a whole set of liveries for free? (In terms of money at least)
I do agree that the cosmetic stuff should be where the micro-transactions lay, however not at these prices. The game must also compensate for this with gameplay and game design that stays far away from the micro-transactions. Hell maybe even remove the option to buy more coins, fuel or premium.
I also think this idea should be expanded upon A LOT, to the point to where you have a custom colour hex wheel that you can select from before buying so now you can choose between 16,777,216 colours! On top of that some Underground 2 style customisation (Yes I know I am pushing this again) and that should seem fair to make them cost tokens but only if it is designed and balanced correctly.
The “You Can’t Color Max Myths” issue would need to be removed from the game in order for this to work, so as for now this is a dream.