I won't believe a great company like Stardock is stupid enough to charge for mods until I see it.
Of course, one could ask where does a mod stop and an expansion start? Still, with Stardock being one of the most pro-consumer publishers out there, I trust they will do the right thing.
"We live on a placid island of ignorance in the midst of black seas of infinity, and it was not meant that we should voyage far."
"Universal compassion is the only guarantee of morality."