I know the obvious takeaway is (to exaggerate) that all realtors are crooks who are selling your house for too little because they don't care about you. But are we to expect that every realtor should spend as much time and effort selling every home as they do on their own? They presumably only sell their own home every few years, if that, and sell other people's homes every week.
I'm actually surprised the numbers aren't "worse" for realtor's own homes. Never mind that realtor's are, presumably, the most aware of local market conditions and are then in a position to best prepare their own homes for a higher sale price, i.e.: more likely to do home improvements that reap a higher return, to know how to best show the house, etc.
Yes, we should actually expect them to spend more time and effort. It’s their job!
Would you be happy with the local plumber spending more time and effort fixing their own water valve or yours? Do you expect construction crews to spend more time or less time and effort when building a concrete bridge as compared to when they pour their own driveway?
These are even examples where we should expect the person to care less about their job than their own personal stuff. Realtors have a fiduciary duty to their client.
I'm actually surprised the numbers aren't "worse" for realtor's own homes. Never mind that realtor's are, presumably, the most aware of local market conditions and are then in a position to best prepare their own homes for a higher sale price, i.e.: more likely to do home improvements that reap a higher return, to know how to best show the house, etc.