Can understand that to an extent pete but why not just post your list with prices and then lock it?
All seems a bit strange to me so no thanks
Edit: not to mention hassle? Having people pm you to ask the price, pming them back with the price, waiting for them to pm back with a yes or a no? I might be on my own here but that seems like a hard way to sell records.
Good luck to the guy though, it is a hard thing to do letting your collection go.