I've found out, through several tedious and unfruitful interactions, that a lot of people don't actually know what the terms or abbreviations are that they are using on their listings. They just put them there because they see them on other listings and think it "is the right thing to say" or spices up or decorates the listing somehow. One instance, something listed at $23 OBO... so I figure they want $20 for it, so offer $20 and get a snotty "The price is $23" "Why did you put OBO then?" "It's just what you put.(Implied duh! Like I'm the idiot that didn't know things)" "It means Or Best Offer." "Well I want $23"...
Another pet peeve...Unfinished projects... like those where they were a couple of hundred feet out of their depth when they started and it got worse from there... usually advertised as "all the hard work done" .... meaning a bit of grunt labor done that probably did more damage than improvement. (However there's a few genuine things that don't need a lot to finish) .. quite often also a "blank canvas" meaning they've thrown out all the model specific parts that will take 5 years to hunt down, or even just field of application specific parts that are spendy and probably could have been reconditioned, and just all that stuff however worn or rotten that you could have used for patterns. Maybe even finished projects (Complete renovation!) done so crappily that the improvements have negative value, while buddy thinks he's tripled the price. In computer terms, "blank canvas" would be like a manufacturer specific formfactor case, maybe a Compaq Deskpro, where the motherboard has gone, maybe even the drive cages, and the front panel buttons and lights were snipped off flush at the rear, or all knocked out and gone. Riser card? Nope, according to our expert seller "it was no good" i.e. he'd never seen one before so didn't know what it did. Basically for this thing to ever be any use again, you'd need a complete donor system that had some very specific damage, like an elephant lightly stood on it, bending the metal out of shape but sparing everything else. Then "all the hard work done" would be like the above, but a Pentium 4 board thrown in there, hanging on two screws and none of the holes lining up. (I've seriously seen engine swaps listed "all the hard work done" where the motor is just dropped in the bay and the one or two mounts that matched up connected and nothing else)
Unicorn herding operations are proceeding, but all the totes of hens teeth and barrels of rocking horse poop give them plenty of hiding spots.