User blog comment:ShinnyShin/The Problems with the S-Class Tier/@comment-27524282-20160325143843/@comment-27524282-20160326051413

Now that you've mentioned it, I read somewhere on this wiki that a useful feature for Pro Kit cards would be to 'upgrade' it. Say you've got a surplus of class D car parts but you need class S cards, you could pay a fee (credits or a tiny amount of tokens [single digits] ) to have it increased to class C and repeat until it gets to class S, the same goes with the tech cards. As for the engine cards, it would work with the i4 being an i6 while you could choose for a V8 to be a V10 or Forced Induction V8.

There could also be a player market for Pro Kit cards. Just like the Steam Community market, players post what cards/boxes they are selling and you pay the seller's price, with some form of pricing control to prevent overcharging.

Thy only problem with these 2 features is that Gameloft could say it eats into their profits with people spending less on microtransactions and never consider at all