“Or Best Offer” seems to mean something different to everyone.
To me it means, “I want to get it sold, and am willing to negotiate a bit. Get me close. Don’t make an offensive lowball offer, and you got a deal.”
If I don’t list the item (OBO) I might still accept a bit less, but only slightly less as I am less motivated to sell.
And obviously (firm) means the price is the price. If I don’t get my price I won’t sell.
To some sellers it seems (OBO) means firm. Or perhaps firm unless they get no bites????
Shouldn’t they list it as (firm), or at least not (OBO), and edit the listing as their intent changes????