Heads up, folks who sell on Zazzle:
Apparently they're looking for a "more active community" (read: wanting to monetize everything on their network) so they're imposing a non-contributing account fee:
https://help.zazzle.com/hc/en-us/articles/360019101674-Non-Contributing-Account-Fees
So either you need to make new products all the time, or have a "Referral" associated with your account over a 15 month period or you'll be dinged for the fee.
I think this is yet another service that is finding itself as part of the print-on-demand glut.