If the question is it worth $120 the simple answer is yes. Almost everyone charges for appearances and autographs. Now $120 is a little high but most other options for getting Gene's autograph mean buying the meet and greet at a show or the Kiss cruise or some other appearance he is at. It's gonna cost period.
As an example I recently got Ace to sign some stuff. But you have to buy his meet and greet package....it's like $325....now as long as you don't bring a guitar to have signed he was cool and signed pretty much whatever you brought.
So just on what I know it costs to get signatures, $120 is cheaper than other options for Gene's signature.