Also, just like games, good mods are made out of passion and interest around a game, or an idea. Project driven by greed generally demonstrate poor quality and gives their devs a bad name, and getting a second chance in the videogame scene is not a simple thing : the public is harsh and unforgiving. Risking to lose all credibility for a few bucks is something most serious indie devs/modders wouldn't do.

And we sure might see an increase of poor quality mods with a price tag on 'em, but that doesn't mean good mods will decrease in number, they'll just be surrounded by a larger amount of shitty mods.

And about people who buy anything, well too bad for them, good for lord gaben ! I can personnally refrain myself from buying anything at arm's lenght, especially aesthetical mods.