Nothing puts the fear of God, or at least David, into an Amazon Marketplace seller quite like the threat of bad feedback:
I ordered an item from one of the Amazon Marketplace shops about a month ago. It never arrived. Seems UPS couldn’t find our house. Now, we’ve had the same address for a number of years and received innumerable packages from Amazon including those delivered by UPS. I started sending emails to the seller. No response. Nothing. Not even a thank you for your inquiry roboresponse. I finally read through the Amazon process for filing a complaint. I filled out the form, noting the problem and the lack of response from the company. Within 12 hours I had not only 2 emails but a live person on my voicemail. They are sending out my package today. The fear of a bad rating on Amazon to be read by the rest of the Davids seems to have worked wonders.
I’ve never had any issues with Amazon sellers or, remarkably, with eBay sellers either but it’s something of a comfort to know that going through channels might actually work.