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DJI agree. If high grade, gotta go with Mastro or REA.
It will be a lot of work and if you accept Paypal, there's more bite from the bottom line. Not to mention the time to scan each item, write up copy and then the work on getting the cards out.
Not to mention dealing with who paid and who didn't pay and perhaps being disappointed that a 1957 Topps common in PSA5 form doesn't sell for what you want or reach your minimum bid and then the time to relist them and such. Also, what if half the cards sell. Basically then you only have the eBay auction, selling in bulk or singles.
Or you can try selling the whole set on eBay and place a reserve on it. You could always test the waters and if you aren't happy with the lack of bidding action, try again and return to the original question- Break up or send to a glossy catalog!
DJ