Yep, Cobia - those people are out there. I've had people offer to buy 10 $2 bills for $15. Um - sure let me pay you $5 to take this stuff off my hands.
Now, at yard sales I'll try and get a good deal. I will lowball something if I think I can get it. Or if I'm buying for the thrift store. We roughly pay 1/2 of what we think can get back. I get told NO at times, Yes a number of times, and a few times will haggle.
Case in point this past saturday - guy had 4 nice wood chairs at $20 each or all 4 for $60. Now, that is what my buddy can get at his store, around $15-20. I told her up front I may be interested in them for the store but I don't think he would go for the price. While I waited for a response I checked out the yard sale right next door (love twofores). Buddy came back with $30, she asked her hubby who said $40. Now, she had also told me about a 5th chair out back and went to get it for me to see. While waiting hubby mention that a) they not sold anything yet that morning b) they had a sale last weekend c) really didn't want to put this stuff back. So I offered $35 for all 5 chairs and they took it. Didn't have change so I tried to get a little tikes picnic table and a dora trike for the $5. He said $10 so I settled on the picnic table...which sold less then an hour after I delivered it for $12.99.
Different yard sale had a tent (no instructions, pita) for $5. Had a 10 yr old 5hp shop vac and a newer 1.5hp shop vac for $20. Had a pair of ok bar stools for $15 or $20. Now stools go for 7-10 bucks, not had any vac's to sell and tent was iffy. Offered $30 for it all. He said NO so I walked away and headed to the next sale which was above.
Some of these people just want stuff gone...specially late in the day. I've picked up whole boxes of random stuff for $5 many a times. It's like a small version of a storage unit. I rummage real quick - see 5-10 bucks worth of stuff and offer $5 for the box.