I'm not sure if Jim Port meant that range was too high; or too low. As said here a million times, too many factors to quote a price.
When I sold my last house, the buyer's HI noted that the P-trap under the upstairs bathroom sink was loose where it connected to the waste line. It was missing a plastic compression washer. I lived in the house for 7 years, had no idea, it never leaked, otherwise I would've fixed it. BUT the contract said any issues that we agreed to fix as a result of the HI had to be fixed by a licensed professional.
The plumber charged me $160 for what amounted to a 10 minute visit (non-emergency). Going rate in this area.....