Value assistance with Mickey Cochrane autograph

[BradH]

Hello-
I’m looking for some help on an approximate autograph value. I have someone interested in buying an SP Legendary Cuts card that I have of Mickey Cochrane. The signed card is from the 2007 series (numbered 7/7).

Today I did a quick check on eBay and found 10 Mickey Cochrane autographs for sale:
-- Seven PSA/DNA cut signatures ranging in BIN prices of $400-500;
-- One signed newspaper (?) photo, complete with LOA from the recently-discussed Mr. Priddy (ACE), with a BIN of $999;
-- One SP Legendary Cuts card from 2003 with a BIN of $3950;
-- One SP Legendary Cuts card from 2007 (same as my card) with a BIN of $2575.

I’m very uneducated in this area, but I really don’t see how the seemingly outrageous BIN prices for the SP cards can be accurate. I know people sometimes jack up the BIN prices to see if anyone will bite, but these seem way out of line to me.

I’ve been offered $600 for my card, and I think that seems reasonable, but I would like to get a decent idea before I sell it. Should I ask for more? The thought occurred to me to put it on eBay to see what happens, but I’ve never sold on eBay before and really don’t want to take the time to mess with it.

Thanks for your thoughts.