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I had a Motorola Merckx on eBay for a few months at a very ambitious price but it didn’t go so I gradually reduced it and it ended up going for a price I was happy with even though the tactic didn’t work that time. Possibly annoying for people who offered me that initially but what did I owe them? It wasn’t taking up vital space and it took next to zero effort from me to maintain the listing so it was always worth the gamble
I've definitely done it with things I know someone will want, like odd vintage bike stuff which will eventually go for £20 or whatever. It just sometimes takes ages!