Wait until you find a flaw in something that's already sold! That's where you really have to put your thinking cap on.

If you've got hundreds or thousands of items to sell and you can't get them all listed straight away, put your time into listing the best ones while ebay is still functioning properly and people are buying (and before the scammers really get out of hand), then deal with the flawed ones after you've listed or got rid of all the others. That way you'll get a lot more money back for the time you spend on it until you get to the flawed ones, but by then you may have had enough of it all and be happy to quit selling together, or you may have found somewhere else to sell them.