I find that the biggest impediment to trading is, ironically, too much data. Some collectors insist on reducing every transaction to money terms. Easily done when you are talking about SGC 40 T206 commons that have a good sales history, not so much when you have cards that are very limited in numbers that haven't transacted for a while. I don't like that sort of cash-concerned trading and I will generally not pursue a trade with someone who wants to go through that exercise because it isn't fun for me. The 'funnest' trades are the ones where you have a bunch of cards I need and I have a bunch you need and we just swap 'em.
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