I am a long time crusader of forgeries. though not in the public eye these days, I've done my share of signings, trading etc and know from whence I speak. Mark is one of the very first people I ever spoke to when I first started collecting and that's over 13 years plus now.
I will say this: anything bought off of Ebay, even by all of you here, is suspect. It's my view that anything bought, unless from a provable signing, is always suspect. If you bought from me, I would assume you'd feel it suspect even though I am the most honest person you'd ever meet. It's just how it is; unless you've seen it signed yourself, everything is suspect. with that said, people get offended when they get stuff in person and are selling and people question it. You shouldn't. It's business. Question EVERYTHING.
Now, the resolution of this is very simple. 1) the person posting this info after two years needs to let it go. They were refunded. The fact Mark refunded shows he's a good guy. 2) Before buying the item, the person needed to research and not trust blindly. Doing so is THEIR problem! Buyer beware as they said. and 3) Just because someone sold fakes, doesn't mean they did it on purpose. Everyone, even Autographworld, R&R Auction and Sotheby's makes errors. And Sotheby's is probably the most renowned auctionhouse in the entire world. I've seen fakes from Mark and all mentioned. I saw one in a catalog from Profiles in History too! When I buy, I research. And as far as Mark goes, I most certainly would buy from all his private signings. There's nothing forged about those. So it's not prudent to ruin someone over this. Just don't buy certain items if you are worried.
Oh yeah, one more thing... there's quite a difference between someone selling fakes "honestly" meaning they didn't realize it was and forging an item. So to call them a forger is reprehensible.
With all this said, I always think it's okay to speculate now and then. Just two days ago I won off Ebay a 4.00 index card signed by James Eckhouse. I spotted it and had a day left to decide and thought for that price I'd take a shot. It was inscribed to someone else so odds are it's legit or secretarial. Before I'd EVER consider selling or trading it though, I would personally research what I can and then be up front about where it came from. I would expect the buyer would be prudent enough to ask too; but from my experience is that those who yell the loudest about these things....they are the least to research or ask questions.
Lesson: RESEARCH.