Around 10 years ago Bioware implemented an effective solution to this problem.
Once someone finished proving themselves in the mod community, they could form up a mod team with others of renown, incorporate, then contract out to Bioware for making Neverwinter Nights DLC. But this opportunity would present itself only if the team could convince the company they and the product selling were worth the attention.
A percentage of the sales got poured into developing future game patches with new features, mod crews got paid, modders suddenly now had a reputable portfolio to be taken seriously, customers get new products to buy, Bioware increases sales, and all the priced content was inevitably released in raw form after final support ended.
The feedback loop produced a better game in the long run. The trick was bringing in only the longest and most respected members who had given to the community already. It would be nice if the entire industry had learned something from it.