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They aren't free. The artist gets paid, and probably out of a budget. The budget is allocated from incoming funds. Incoming funds are most likely garnered from sales. Yes, your PHB could have been $0.0001 cheaper!
I doubt we're seeing a whole lot of brand new commissioned maps over there -- I've seen a lot of old stuff from old modules and other sources up there. Not that I don't appreciate them.
I admit that the ones that are like pictures are less useful to me overall.
No, it's surely free, but that doesn't mean it immune to criticism. Let's say Map-of-the-Week was compiled from community submissions, I think they would be very different.
That is actually a very good idea. A forum for anyone to post maps, mysterious writings or anything else that could be used as an adventure hook.
This could grow into a substatial database almost overnight. What DM doesn't have a huge quantity of old handouts and such he's given players? Gods I have a binder of just htese sort of things. You should suggest this over in the Publishers forum Zamdrist - I'm sure someone would be willing to host such a thing.