No, I realize you might just be making a joke, but he was quite clear in his book that the money should go to the recipient. But regardless of that, I think it's a good idea. It would not only limit spam, it would also straighten out certain aquaintances and relatives who have a ten-to-one e-mail ratio.
I was joking, but I don't see this happening, nor do I see it as an answer to the spam problem. Most of the spam I get isn't from legitimate businesses. It's from guys who are trolling for an individual dumb enough to give their CC number out over the net to businesses that send spam and don't have a contact address or phone number. They hack an email server and use it to toss messages, then hack another domain and put up a single page web site with a form to get your info.
Unfortunately, the scavengers on the net are going to keep going until the net is as regulated as all the other businesses. Even so-called legit businesses scam people. AOL keeps charging your CC after you cancel your account. Free Credit Report (the web site with the annoying ads with the stick figure guy) charges your CC $80 for your "free" credit report, and then sends you a credit report every month.