I'd be willing to bet he's turned down numerous offers on the Church Action 1 and the Allentown Tec 27. Just my opinion obviously, but highly likely given the fact they're the best known copies and it's common knowledge that he owns them.
As to how much it would take for him to sell? I have no idea, but wouldn't be surprised if he wouldn't sell regardless of price offered. If I were him, presumably not in need financially, I wouldn't either. I'd imagine that after a certain amount, a ton of money is a ton of money, and further additions don't have much bearing.