Quoted from stpcore:If a seller lists a price and says "OBO" does that mean it's OK for the seller to decline your offer of their full asking price because they want to see if someone will give a "better offer" over asking price? I've had this happen to me once and I lost out on buying a pin and was a little surprised, lol.
Yep, OBO no longer means they'll accept the highest offer that's close to their asking price. Nowadays, it means they'll accept the highest offer OVER their asking price.
In other words, they're starting an auction. Don't bother to participate because you don't know if the other interested parties are really making the offers the seller states they are, or if there really are other interested parties at all.