I agree, that would be great! I have contacted people I noticed had bought fakes before, but they've stopped allowing you to contact anyone know unless you've won/sold something from/to them, and you can't even see who bought what most of the times now. I used to check through dodgy sellers' feedbacks sometimes and e-mail their buyers and hope they get their money back.
I have also reported sellers many many times for selling fake Chanel, Dior, Mac, etc., but they still continue to do so, because eBay don't do anything about them. Very sad.
Also people are so naive and buy any crap that says Chanel on it, the number of 8-10-12 colour Chanel eyeshadow palettes I've seen on eBay is ridiculous and they're all called Nymphea. I could carry on for ages, it really pisses me off.
Having said all that, I actually really like eBay, I buy cosmetics from eBay all the time and I have found many bargains, and picked up many HTF items like my Pleasureflush or Lightscapade MSFs
and I don't mind paying over retail for something like that, but my blood does boil when I see someone listing 20 Stereo Roses in one go for £40 Buy It Now price each and then come on here and read about all the lovely ladies who had missed out on Stereo Rose at their counter or online.
that would be such a good feature. especially for people selling fakes, and naieve people buying them. that's another thing on ebay that gets right up my nose