Depends on the mod.
Something that uses outside apps, eg 3DS MAX and a lot of time I guess you could say there is a fair point in charging but only if that is to cover costs.
Now what gets me is IL-2. Apart from the official expansions eg Aces over Europe and the other European theatre one, the mods I have seen for sale on X-1 and other places, eg Operation Barbarossa and Fall Blue seem to be massive new campaigns that have been put together using the IL-2 mission editor. (IIRC you can't mod IL-2 that much ie adding new models etc.) That's like me or someone making a huge dynamic mission in DW using the editor and then selling it.
It is a thorny question.
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