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andy beckerwhat david said is true, you certainly don't want to delvelop a reputation for shaving a dealer's profit to the bare minimum.
but to directly answer john's question (hi john), i would say....the purchasor and the seller of cards (or anything else) must have good knowledge of what he/she is selling or buying.
if you have good knowledge of the value of an item, then you can set what is a fair price as a seller. as a buyer you can accept a fair price without negotiation....or you can negotiate a fair price.
knowledge is power. those in the know will not always be able to agree on a deal, but if one party is clueless....then a fair deal is highly unlikely....almost impossible.