I hear you but no disrespect you are not a MODDER! you are a CODER!! Let me explain!
Im not gonna mention names but the biggest and best MODS in Skyrim that are actually almost stand alone games and take TEAMS to do them are FREE!!
Not to mention 7Days2Die where modders have practicacly inspired the newest update alpha 16 and the newly releaseed preview of alpha 17 as the dev as inspired himself and incorporated most mods from the community on to the game, having said that
Did Bethesda charging for mods work?
Did steam charging for Mods work?
Did the most famous modder that left the nexus to charge for his mods (which by the way mostly stolen work lol) did it work for him?
NO!!!
Why you might ask?
The modding and its community its about SHARING FREE OF CHARGE what you love to do! and if someone makes it better they fix it and credit the original modder ect
Now having said that, that doesn't mean you can't ask for compensantion for your hard work but should be optional, under your logic i have to PAY $20 a YR for a mod to a "FREE" game $20 can get me a REAL AAA Title game on kinguin man!!!!
Should reconsider your position, you like $5 a pop and selling only 10 of them = $50 or wouldn't it be better 100 at $1 that = $100?
Sell by volume sold and not per max profit!! Biz 101