I have some autographed stuff. I only have interest in autographs I recieved from the source. Sounds like you are getting yours first hand too (just lots more than me). I don't understand collecting of autographed memorabilia purchased presigned. I always figured the point of getting an autograoh was evidence of a first person encounter with someone. Besides it is all but impossible to verify if the third party seller even has a legitimate item.
My favorite autographed item is a daredevil sketch that Lee Weeks did for more wife because she got jim a cup of coffe at a convention. The same con Roger stern drew a Superman emblem and signed it and a comic for us.E Gordon Gee signed my diploma from OSU.
PS I have paid for a few like Tim I got Yvonne's. I bought a book from ferrigno and he signed it, Gerard Christopher signed tapes i bought.