I checked his (her?) other listings, and I doubt that he is a stamp collector. It is a pretty eclectic lot, kind of like what you might find any Saturday around here at garage/yard sales. Who knows, he just may be speculating, without knowing what anything is really worth. Pick up items for 25 cents to a buck at yard sales, post them on
ebay for 5 or 10 dollars, and if one or two items sell every now and then, maybe it is a money making operation. Not a lot of money, but enough to encourage him to keep at it.