FWIW - one of our neighbours put their house cup for sale a few years ago.
It was a beautiful house, very well maintained and decorated - they got and accepted an offer the first weekend.
Then she thought "I've accepted too quickly" and cancelled her acceptance and put it back on the market for £X,000 more. Same thing happened - quick offer - she accepted, then pulled out for the same reason. Did it a third time. Put it up at £Y,000 more and got a quick offer which she accepted.
As the sale was about close, it fell through. As it happened, I know the third set of buyers, so I found out what the craic was. She had decided (yet again) that she was "giving it away", and so shortly before completion told them she wanted another £Z,000. They were very upset - but more than upset, they were angry and told her to get stuffed!
The house had to go back on the market. Whether word of her shenanigans got round our what, I don't know, but she didn't get an offer for ages, and had to drop her price. And then drop it again.
We found out from the new buyers that she ended up selling it for around the original selling price, and in the meantime she had lost the house she had been interested in, and had had all of the stress of the faff and carry on (plus people coming for a look around for months longer than she need have done).
Sometimes you win, sometimes you lose.