Thing is, they're really good friends with each other. So if Panini could convince one of them to sign, they could probably get the other as well. Uncle Reg & Sir Charles could just make it a hang out session. They tip back a few brews and sign a few hundred cards, and make a nice chunk of change in the process.
How cool would a Reggie Miller/Charles Barkley DUAL AUTO be? That would sell crazy high.