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MarkEbay definitely does have autograph "watchdogs" looking out for forgeries. Don't want to put words in his mouth, but I believe Jodi B. may know one or two of these people.
In the mean time, you can file a fraudulent item report. Look for the link towards the bottom of the ebay listing. Click on it, and it will take you through the steps to report why you believe it's a fake. I have done this many times with bad autographs (STAT, Morales items), and each time, ebay has eventually terminated the auction.
The sooner you report these as frauds, the better. Often, these sellers of bad items will make "Buy It Now" deals (outside of ebay) as they realize their items may not make it through to the closing date. So the quicker you report it, the better chance of shutting down any potential transaction (on or off of ebay).