[talmand]

Well, if Bethesda gave the game away for free and wanted a source of revenue from mod makers, sure. But it's quite established that a strong mod community results in continuing sales for the game beyond a normal product lifespan. In some cases, the price of product remains higher than normal because of the strong sales due to the mod community. Bethesda has already made money on the backs of mod makers.

A proper response to this is to give all the remaining money after Valve's cut to the mod maker as a thank you to the community.

But this doesn't even address the other problems that people have been pointing out.