My personal opinion regarding MEIOU and Taxes for EUIV : even given the option, i wouldn't like to put it for sale. I mod for the pleasure of modding, and to share some fun with what i believe to be the best gaming community.
On the other hand, would Paradox allow for a donation (as in it is up to the player to choose to give or not) to help us support stuff, organise team meet-ups,... that i would welcome gladly.
An that's a noble sentiment, and one I share - hell, I won't even take donations. If people gave me money, I would feel that I owe them; I would lose the complete creative control I enjoy presently. Currently, people can (and, over on SA, do) say whatever they like in response to changes or design decisions I make; I don't need to care, since I owe them nothing. I mod for me, and I let other people download it if they want to. When I want to stop, I can just walk away; no-one is losing out because I can't be bothered to finish or don't want to continue. Moreover, if I earn no money, there's an innocence which might otherwise be lost. If I see a cool feature from another mod, I can ask permission to include it and then stick it in my own work. If I was charging for it, that becomes much more complicated, very quickly (and if THEY are charging for it, even more so).
However, I think modders should have monetization options if they want them. Even the largest Paradox game mods are relatively small beans, after all - if we're very, very successful we get 20-30,000 users, and most mods here will be played by less than 1,000 people. But consider the major Skyrim mods, or (going back) Darth's mods for the Total War games; these were played by hundreds of thousands of people, had modding teams of 50-100 people, and in some cases actually encouraged people to buy the game in the first place. It's a bit like freedom of speech - I may not choose to say certain things, but I support the right of other people to say them
even if I personally disagree with it.
The real issue for me is preventing scam mods, or mods which promise things which they cannot possibly deliver - often without even realising it. Even the best of us comes to a new game without the slightest idea what can or cannot be done, and checking is often low priority when drawing up plans for a new project. Highly experienced modders have fallen into this pit, and it's all the worse when an inexperienced modder attempts to begin. How many mods have been proposed and then quietly forgotten on these very forums due to authorial inexperience or overambition? And how much rage would it generate if those modders were taking money before they realise their project is doomed?