I recently bought a 67FB merc on
ebay to upgrade my collection - by far the most I've paid for a dime - and then listed the 66FB merc I replaced it with on
ebay.
Found it ironic that the same "hi volume" dealer that sold me the 67FB then bought the 66FB from me. With all the folks on
ebay, I just found it ironic that we "swapped" grades.

I bought for $600 below retail list, and sold for $36 over list(I think that list price is too low tho - one of those low anomolies).

I'm guessing they have a customer itchin for the 66FB. I do remember now that it took me a while to find it originally.
I'm not a hi volume seller, but I don't think I've sold anything to a dealer on
ebay before. All of my prior sales have been to individual collector's (from what I could tell by their account name and volume).