Perhaps he should try this dealer -- 37,000 PSA 10s!!
http://www.ebay.com/sch/m.html?_nkw=..._sharp_corners
65,000 total cards. Staggering. By some crude math, his cards would go all the way around a quarter mile track, or be nearly as high as the Empire State building.
EDIT TO ADD It's been pointed out to me that my search for "PSA 10" includes a number of items that are not PSA 10s, but items where both PSA and 10 appear in the title. Still he has a lot of PSA 10s.