OBO can mean a lot of things too. I have secured some really great deals by paying MORE than the asking price. I bought some Wilton vises one time that where listed on Craigslist for $300. One of the three was a 8" machinist vise that has a new retail price of $3500. I called the lady and she said already had someone coming to look at them. I said "its Or best offer right" she said yeah but he is willing to pay full price. I told her I would pay $400, I got the vises. I sold one of three for $800 and kept the other two. I onetime bought a Bridgeport mill for $300 that was listed for $200 OBO. If its a great deal it pays to offer more than the asking price just to make sure you get the deal. There are often many replies, yours needs to stand out.
In my book that is wrong. I understand most people want to get the best price they can and if you offer more
and they accept that is cool.
I am not saying you are wrong to offer more, but If I tell someone I will sell an item for a certain price it is a done deal. That is the way I am. My word is my bond just as a hand shake is. I may have got myself screwed a few times but in the end I know I did the right thing.
That does not fall on you as the buyer. It falls on the seller. Just like everything else it all comes down to each person.
I have no problem with people asking anything it is just talk but when a deal is made it should be done.
I have had sellers remorse.