As an auctioneer I try not to take identical items from different consignors. I also, where feasible, break up high end identical items even from the same consignor (parceling out 3 Aaron rookies in 4 over our next few auctions)
You DO want SIMILAR items to draw attention. If you've got a rare bakery card and it's the only one in the sale, it may not get the attention it would if there were a couple dozen bakery cards that brought those specific collectors out of the woodwork.
Just my semi-educated opinion, and obviously there can be exceptions.
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