You have an hourly fee for your leisure time? What did you charge your parents for your visit to their easter brunch? 
My point is, that these costs (time, ordering, picking, memories when a record was played, talks you had with your friends, whatever that you already invested in your collection or is connected to it for you) is being quantified through the auction system. Its one of the most accurate systems we know untill now to express these otherwise hard to express values.
Hypothetically: You are a big Gerard Joling enthousiast and have collected all single versions of No More Boleros through the years, have them in neat plastic bags and in a nice order in a closet. The time you spent enjoying the collection, the hours on ebay, the fanatic recording of Gerard Joling Tros performances on your VHS, all this has cost money, but it also gained you utility. You were willing to pay monetary costs and opportunity costs for the collecting and enjoyment of the record. When you auction these records, the assumend excess utility, what you expect to gain from it in the future, is being set into a price. This includes the possible enjoyment you get out of playing the record, putting it on a different place on your shelf, looking at the sleeve, whatever.
If you are a completist and have THE no more boleros collection of NL but want to get rid of it, the chances are quite big you'll get a good price for it, just because it is so complete. The excess utility of your collection is high and being rewarded by the market. Another true fan is seeing expecting that his investment will lead to enough utility for him to meet your reserve price, or pay even more for it.
You are selling the future enjoyment of your records, takoing into account an intangible value: the cost of you parting with the records.. This is a quantification of the time and love you invested.
maar de gedachte was leuk