I don't use Best Offer so when I get an unsolicited one, I just say, "I'm sorry but at this time my price is firm. Thanks for your interest." I use "at this time" as a, well, teaser.
If I did use Best Offer and got a lowballer, I would just change it to: "I'm sorry but at this time I am not able to reduce my price by that amount. Thanks blah blah..." Or something to that effect.
I wouldn't go into fees, shipping, profit or other explanations.
Edit: Oh, as a buyer what do I prefer? The few times Imake an offer via Best Offer I either get an auto decline, which ticks me off because I never lowball, or my offer is accepted. I don't remember getting a message.
Sherry
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