It has to do with how much time & effort that the auction house needs to do to get your stuff ready to sell (grading, describing, etc,...). If you have a substantial amount, do you want it in a separate physical catalog as something like "The sealmark collection" ?
Be aware that all auction houses will take all "auction worthy" stuff, but some auction houses seem to bring higher prices for certain material depending what it is (ie baseball, basketball, football, hockey, non-sports, uniforms, equipment, autographs, vintage, modern, cards, etc,... For example, a certain auction house might be better for a 1986 Fleer Michael Jordan PSA 10 than a Babe Ruth game used bat.
Best of luck !!!
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