[munk-a]

They tend to get a lot of community accolades but yea - spending time fixing someone else's intellectual property isn't a great place to start your proposition if you want to make money.

Even traditionally mod friendly companies will tend to sweep in and either block any derivative work that's monetizing their improvements or else negotiate with the creators to take the lion's share and republish the content under their company label. There are a bunch of examples of this but Counter Strike is a pretty famous one.

That all said, it's pretty hard to argue that making minor alterations to a product should allow me to resell it as a novel work. Fan Fiction exists - but it doesn't (legally) exist as taking a novel and taking on a few new chapters then reselling it without giving a portion to the original author.