For pete's sake, who is saying the lens doesn't work? From experience, most of us know that such a fast lens requires a very good understanding of how it works, and how to use it. I am quite sure the lens works, and I am quite sure the person found a good deal, bought it, and doesn't know how to use it. A non-working lens isn't the issue here on this thread.
The issue is that if you sell anything online and use a well known payment service, you will also have to be prepared for returns, so you have to factor that into how and what you sell. Nothing more. It stinks that there are ignorant and ill-intentioned buyers out there, but it comes with the territory today, so you have to learn to take the good with the bad.



