Some 20 years back I met Stan Lee at a signing, and was rather disappointed that he didn't personalize, even with just your name. And it took him longer to say he didn't personalize than it would have for him to put it on there.
Obviously he signs thousands of items a year, but I know I would still have my piece if he had put my name on it, because it would have meant more to me than some "random" book (which I can't even remember the name of now) with just his name.
I know he helped "create" most the stuff out there, but I really don't see the value in just his name. Plus I would think he’d rather want to personalize as the percentage of those winding up on eBay, I would think, be considerably less.
Just my 2 cubits, FFIW.