It's probably rhetorical but I'll bite. Because NM 87 and 98's are already well known to the market unless he can source them super cheap, he'd still only be making the difference between what he would have to pay for a copy and sell with his signature. This way he doesn't spend all the time hunting them down and money buying and selling them (not to mention grading/shipping fees). He just sits and let people pay him the difference for his signature
Exactly, why do the work of finding a nice copy (not to mention learning to grade), paying a couple hundo for it, keeping it high grade, paying admission to the show, standing in line, hoping the creator doesn’t manhandle the book while signing, paying CGC fees, paying shipping, crossing your fingers the grade doesn’t change, then do the work of finding a buyer. Why do all that when you can just charge what you *think* your signature is worth because your perception is that everyone is making money off your signature you’re giving away for free. Because it’s just so easy to sell SS books and buy a Porsche with the fat stacks you’ll take in.