Quote Originally Posted by khelvan
Quite simply, the company that created the game owns the right to distribute its code.

By definition, a modification is a change to the code of an existing product. Unless one has acquired the rights to sell that existing product, one cannot charge money for one's modification.
IP rights for games are very strange at times, however if they weren't protected then no company would invest in game-making at all.

So long as noone is skimming off the potential profit for the company, however, it seems like most are happy to let mods be made - as free promotion and to reduce their need to update content periodically.

Personally, I think the "business model" could probably stand some changes but its tricky to do it, and it sounds a bit weird, so selling it to investors would be a bit of a task.

Oh well, whatever the reasoning, EB can't/won't charge, so everyone just count yourself lucky and donate to maintain their site. :)