Some of eBay's sellers are angry. They're angered over the auction giant's planned changes to its fee structure and feedback system. A portion of sellers are so angered about the no-ifs-ands-or-buts-like method with which the marketplace is enacting the changes that they've coalesced and have threatened to strike. And now they've set a date, reports Lenora Chu of Fortune Small Business.

Don't upset your user base.