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Some things do develop without the "help" of capitalism. The Poser community is actually a wee bit older than the marketplaces.

Yes, it is, but Poser wouldn't have maintained its momentum without the marketplaces, I don't think.
In the beginning, there were loads of freebies, some of which are still here, but might have dead links. People like PhilC and nerd and Traveler and others were making all kinds of free stuff and also making all kinds of discoveries and sharing all that, but the popularity of it and the fact that your average Poser user at the time didn't have access to good modeling programs, never mind the knowledge to use one, led to a strong need for more stuff.
And more, and more, and more and more and more...

Eventually, Poser's success itself created the various marketplaces, because capitalism doesn't "help" things along, it feeds off of a need. In this case that need was more and more stuff to plop into Poser.
It's symbiotic now. Poser and the Poser marketplaces exist because each of the other does.