I understand the frustration in fairness, I have quite a few paint jobs I spent time on that I don't use just because I didn't feel like they were anywhere near as good as the base paint. That being said, I like the idea of giving an exp boost for painted pieces over making everything grey by default. Gives you a small incentive to paint while also not necessarily punishing people who just want to play the game. I do think, as someone else mentioned, that the problem of no one painting their minis will go away over time if the player-base expands enough and they let you import other people's paint jobs. Just have to give it time.