They start out trying to but then time drags on and they “just want it to be done.” At that point the seller is also prioritizing a deal over maximization.
Agents, since they’ve gone through a tonne of these processes, are more immune to the mental load the sale takes on them. I’d bet they’re less likely to try and blow through those final steps.
You can see this kind of thing play out across industries. In SW, a comparison may be the seasoned dev has no problem ripping apart their candidate solution and rewriting it since that process takes them less effort than the junior.
The time, and marketing, costs of a property tend to go up with price. If I'm buying a 12 bedroom mansion, I'm going to expect a lot more photos, better staging, and so on in the marketing compared to a 1 bed apartment.
Equally small, cheap, properties are likely to sell faster (bigger buying pool) than more expensive ones. That $20m mansion is going to take a lot more visits than the $200k apartment.
In other words, there is sufficient variability in the cost of selling to warrant a sliding fee. And generally the best way to do that is as a % of the sale. A % BTW which is negotiable based on how fast the realtor thinks the property will sell, and the sale price expected.
It sure isn’t worth 6% of the sale price, especially considering that the sale price is literally double what it was 2 years ago.
Clearly not everyone needs, or wants, a realtor. But presumably there are enough who do to keep them in business. There are enough who don't to keep the "do it yourself" market in business as well.
Choice is good. What is good for you might not be good for the next person, and vice versa.