I think this question could start generating some negative feelings or resentments.
I would pay what I think the notes are worth.
When I bid, I select the lots I am interested in, and then do my research with the Charlton guide as a reference, and looking at some older auctions. I establish my max price and then factor in the buyers premium and the taxes in, so I do not over pay of an item.
Like anything else in life, it is buyer beware. If available, make sure you examine the notes, and make sure they are as described in grade and variety.
Remember, when the lot closes, and you are the highest bidder, you bought it.
If you no longer want the item, or you paid too much or you (buyer’s remorse), point the finger at yourself, because it is your fault.