Some things go very low.

I find secondhand dealers who have a shopfront store just bid up up and up if people are bidding against them so they push the bidding to a price they would sell it at in their shop.

Usually antiques, CDs, DVDs sell quite well - even junky LPs the past few months

Sometimes auctioneers will say something like 'couch is worth $3000 new' and 2 got no bids at $100 last weekend so are they really worth $3,000?. secondhand dealers would grab them if they were at $100!

Websites that say like 'RRP $99' and advertise it at $25 are just as bad because you can look for the same product on eBay and you will usually see it for the same selling price at $25 as them. DD is a bad one for that