Well for one, Zazzle did somethng about the spammers...
they limited each designer to a total of 100K products....They hide the products that were not getting any views in a certain period of time...So, now, after some time if nobody sees a product it will hide itself from teh marketplace and wont show up in a search, and will only live in the shop store front...
And there were a lot of people who had way over 100K...but we were tired to see all the same exact design in seven different shades and a lot of junk stuff that no buyer is interesting in buying....
so there is defintelly opportunity.