One of the disadvantages to popularity -- everyone wants a piece of the action. Pinball is hot right now. How many of those "Want to buy your pinball machine" ads do you see on craigslist?

I recently listed a project machine for $200. I knew I had listed it too low when the inbox started blowing up, and then the offers for more money started coming in when it was learned I was waiting for a potential buyer to pickup. I had $200 in the machine, so I was happy to get that back out and pass it onto the next person. People throwing higher offers/more money at you make you think you've priced something too cheap -- but the seller should be doing his/her homework first before pricing/listing something. Aggressive buyers and uneducated sellers can quickly make an easy transaction difficult.

That being said, I have been in situations where OBO was directed as best offer over the stated price. Basically an auction. I walk away from those scenarios. Ideally a seller would price something higher than what he needs out of the item and then add OBO so potential sellers feel they get a "win" when a few dollars come off. Just my 2 cents opinion. . . or best offer.