One thing that's always bugged me about Frasier (and this is a very small nitpick on the whole) is the recurring mention of Frasier's bad radio ratings.
I work in radio and bad shows don't last long. One morning show lasted a whole 4 months before it was rearranged here. In my experience, the more niche AM talk stations may have more leeway (if you've been in last place in ratings forever, why not for a few months?) and KACL definitely seemed to be a sort of bizarre talk radio station on one of the far ends of the dial. I mean, a call-in psychiatry show, a fine dining review show, a gardening show, etc? KACL definitely wasn't a "mainstream" talk radio station.
Frasier's radio show just wouldn't be on the air for 11 years if it was poorly rated. Plus, later in the series, he is syndicated (to Spokane, etc.) and that wouldn't happen if he got bad ratings. Plus, Frasier seemed to be extremely well off and getting long-term contracts for a show that always seemed to be having "bad ratings crises" once a year.