There was a long thread a while back on the Ebay shoes and accessories board re Jaimemc - about a bag that reputable people said wasn't authentic, and the seller took down the auction after so many people saying the bag wasn't real.
That scared me so I don't usually look at those anymore - I looked at those auctions all the time before that. I think most of the bags sold by that seller were real, but I tend to be overly cautious if I hear about someone listing a fake. I had a lot of respect for some of the people who said it was - kind of like John on our board.
I've bought from authentic_lvlady and been very pleased, so I can vouch for her.