Why do sellers bother to put O.B.O. on an ad when their price is firm in the first place? It doesn't hurt to ask someone with a O.B.O tag on their price what their bottom line is and invariably when asked in my experience O.B.O. sellers either get offended or do not respond to questions. A simple FIRM on the price in the ad goes a long way to stave off low ballers.
Doug Henning disappearing act
I've been receiving quite a few offers on gear I'm selling, only to have the would-be buyers disappear when I agree to their terms, and within 5 minutes of receiving their offers! Based upon my discussions with other sellers, this is not uncommon. Please consider whether or not you are willing to commit to the purchase PRIOR to making an offer. The integrity of this community depends upon it. Thank you.