Depends on the value of silver... Most people would only pay about $1-3 more than the spot price of silver. You MIGHT find a die-hard New York Yankee's fan that would pay more and that is the game of supply and demand...
Good Luck.
PS I own one.
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A Don Mattingly Signed Bat is worth between $150.-$200. The most preferred bat for a signature is a bat closest to the size, and model the player used. The better the quality of the bat the higher collectors value it will have.
Value is based on average prices of recently closed auctions. Prices may vary based on condition, and the type of authenticity that accompanies the signature. Signatures that have not been properly authenticated could sell at half the market value or less. Add for inscriptions.