Ok something very obvious needs to be said about this, if you dont want to pay for a mod then dont do it! just use free mods. also dont be entitled to mods, dont think like "I'm going to pirate the mod because fuck paying for it!" just dont use it if you dont want to pay.
People saying that this is shit you are not being forced to use it, while I agree that there are a bunch of negatives about how this was implemented, the idea is really good.
To address some of the complaints I have seen,1 good moders are going to keep their mods free, they already have "tip jars" in patreon and paypal and they would get paid more by keeping them free and having a link to their tip jar next to the download link for their mods.
2 if a mod doesnt work with another mod its not steam's or the mod developers problem, buying a couple of 3rd party add ons to a game and expecting them to work perfectly would be ridiculous unless it is specified by both mods that they do work together.
3 if you blindly buy a mod that doesnt work/you dont like its your fault, I expect anyone that actually takes time to mod their games to do their research before installing anything so I would expect the same if you are going to invest money in them. a counter argument to this one might be, but what if there are no reviews of the mod? or something similar to that, my answer is dont buy it unless you trust the developer, if mod developers want their games to be bought they need to make a name for themselves first, they need to earn our trust, and the easiest way to do that is making some free mos before a paid one, or allowing some sort of preview.
4 "this is the same as DLC!!!" no its not, the problem with DLC is that companies cut their games in half to sell the other half later, not that they charge for extra content, and since the mods arent even made by the creator of the game then this problem doesnt exist.
5 "this is the same as Early Access" when you see a mod that states that its not finished then dont buy it, just because they promise they will finish it or that it is super fun it doesnt make it true, and Im sure anyone reading this has never bought an early access game that they didnt knew beforehand that the game was great.
6 VALE is greedy!, yes they are a company in a capitalist society they need to be, but if since you live in the same capitalist society too then you must know that you are not forced to use their services, people say VALVE is shit mainly because early access and now this, but all the other services that VALVE offers are pretty good, I might be missing some other things that people dont like about them but those are the major complaints I hear, in conclusion if you dont want to use early acces or pay for mods then dont do it.
This wont destroy the modding community if we as the consumers do our homework and we dont toss our money at the first shiny thing we see.
Finally I want to add some suggestions that would make this mod selling thing better for everyone: instead of paying up front implementing the "tip jar" would be a better way of controlling for pissed off customers and crappy/unfinished mods, this needs quality control any way of quality control is better than just let anyone to upload crap, as for the possibility of mods being taken out due to copyright then I think the best way to handle it is letting the people who already paid for it to keep it and making the modder to pay all the consequences of infringing copyright.