Actually just remembered another example given to me by my brother in law. He needed a pool filter. A new branded one cost $150 from a B&M shop. They searched on Ebay and found a generic one for a BIN price of $45. Absolutely mortified that he would pay the 'whole' BIN price as he was used to the auction format, he offered $31, which was auto rejected. He offered $32 (see he was treating it like an auction) which was auto rejected. He then offered $33 which was also auto rejected. Buyers only have 3 goes at an offer. He really wanted it, so he then logged in using his daughter's account, put a bit of thought into the offer and considered what the seller may be willing to accept, rather than just offering anything and offered $40, which was then auto accepted.
He was happy because he had saved over a hundred dollars off the normal retail price, but still had felt Ebay 'owed' him a bargain which he had gotten because he didn't pay the whole BIN price. If the seller had manually counter offered for $40 or even $42 and sent a note with it explaining he wasn't making much profit etc etc or whatever was appropriate to say, John wouldn't have used up all his 3 goes at an offer. Another example of a win/win.
To some degree it comes down to psychology, friendliness and interaction, something a good B&M seller applies to their potential buyers. For BIN buyers the same should be applied.
Of course that is not say auction buyers should be treated with distain. Not at all, everyone deserves to be treated with respect and friendliness, but when you sell BIN on Ebay, you must understand that the psyc of buyers is bargain gaining bought about from the legacy of auctions and work within that, whilst still not missing out yourself.