This happens to us rarely. Maybe once out of every 100 auctions or so.
When something like this happens, and I know for sure it isn't eBay's fault, I look at my own way of doing things. And how the market is constantly changing.
Nowadays, many buyers are on their phones. Many of them only see a photo and the title - they don't know to look for more info like condition and description AND they are met by ads from competitors (thanks eBay!). Maybe after bidding they seek out more info and find they don't want yours, but don't know how to cancel a bid.
Also, buyers do like Buy it Now. They don't want to wait. So they bid, and then look for where they can get the item faster. (We still run auctions for all our items but are aware of this issue).
As far as your listings, your no return policy suggests that you won't stand behind your products. I think you're selling used electronics so this could be a serious issue.
I doubt the reply to the negative you got has any impact, but it does make you look unprofessional. Buyers are allowed to rant. Sellers should take the high road, bite their tongues, scream into a towel and then either ignore the comment or type a professional response.
Sorry for my own long reply. Felling wordy today.
