I'm a set collector. My goad is to collect a complete set of Topps from 1952 to the present. When I look at people's Trade Lists, I look for numbers. I have no idea if I'm looking at a Mickey Mantle card or a Mario Mendoza card. I looked at someone's Trade List and found some cards he needed. He had five cards I needed, so I told him I needed any of those five cards. He picked one out and we agreed on a trade. He came back the next day and reneged on the trade because the card he picked for me had a BV of $8 and the card I had for him was something like $2.50. He got a moderator involved and essentially I didn't get the card I needed, he sent me another card. I'll never trade with him again. If you pick the card out, then I'm assuming, if you're worried about BV, that you would have checked it out before agreeing to the trade. It's things like that that make me want to quit the hobby. It's just paper. In the grand scheme of things, its not worth the paper its printed on.
The only card I know its approximate value is 1952 Topps #311. It's worth I can't afford it. Other than that, I don't know, nor do I care, what any other card is worth. As I said before, I understand there are people who are worried about BV and I'll respect that and trade with you on BV.