In my opinion, I always offer a price which is inclusive of mailing. That way people simply bid or not bid according to their budget. Having to email several times to establish the mailing charge is irritating for me as both buyer and seller (long time seller on eBay I might add).
As for Aquabid, I love it. I would even support it financially. But if only Aquabid would include a flat price sales system - eBay calls it Buy It Now. Time would be saved all round. Auctioning items for under $10.00 just does not seem worth it when time is short.
I also empathize with the points expressed above.