@Sergio Loro I agree with your concept, you pay for quality, but what I will ask is, why put this back on the people that drive it, surely you do this for fun enjoyment, like myself. I have done the same, but for me, this is about pure fun and enjoyment and providing the community with great cars to drive and have fun with, this is not about making money?
Also there is this massive grey area, as I have been told already. You cannot sell something that you don't own, being 50, 100 yrs old, that why everything I do, is to avoid this grey area, but also, how on earth can I ask people for money for something that, I am not qualified to do, it's not my job (day to day) and do for shear fun, I just can't.
Personally, no matter the quality, I don't agree with pay mods, they are mods, and people spend their time doing these because they want to, because they get a kick out of doing it, because they enjoy it, and fil the gaps that the software companies won't fill, not because they want to earn money from it. Sorry that's just my opinion on this