This is a pretty complicated offer. The instrument appears to be the equivalent of an SC Signature Deluxe with quilted maple top/back instead of cocobolo.
First, note that the eBay auction will cost you about 25% more than your high bid, and the direct auction 20% higher. Buyer's Premiums are charged as an additional fee above your bid price. This would suggest that bidding on the eBay version is just a way to throw away some money.
Then, even if you win the online auction, it says that there will be an in-person auction where you could still be outbidded.
Finally, they claim a $10K+ estimated value. Does that seem a bit high to anyone else? I would expect this instrument without the signature on it to trade in the $2500 to $3000 price range depending on age and condition. I wouldn't have thought that Stanley's signature would carry that kind of value. The bidding is pretty low at the moment, but it's early in the process.