Just no, so much no, you can't judge the quality on some poorly picked initial mods and all the intentionally bad stuff uploaded by protesting children. Even in the terrible implementation we had, after 6 months you would probably see people asking the same 2 dollar prices for professionally made stuff and all the bad stuff down at the bottom, unbought and cluttering things up. It was a bad implementation, but to think what you said is correct based on 3 days data is insanity. Also the reason "mods never provide it" is because professionals leave to make content where they get paid, or spend their time doing other pursuits where they make money, I certainly did and this is the general consensus on sites like polycount that are filled pretty much entirely with industry pros.
Eugh, so many terrible argument's against paid mods around here, the only somewhat valid one I have seen is the difficulty of sharing resources and the potential that some people will be less inclined to share if someone else is likely to make money from it, it would certainly be a shame if this put a damper on more expansive and complicated mods. The rest is almost all fearmongering nonsense, typical of people being against something and then trying their hardest to find reasons because it suits their agenda.