I guess we disagree that "hits" are the only songs worth playing.
In radio, "hits" is synonymous with "currents"... those songs that are very widely accepted and are, generally, from brand new to no more than a few months old.
In a variety of formats, I've never seen more than 20 to 22 hit currents at any given time.
Some of the worst songs ever written were hits.
In radio, a "good" song is one people give a high positive score to when asked, "how much would you like to hear that song today" after hearing a snippet of the song. We don't evaluate taste, we evaluate the playability of individual songs
TBH, i have 1450+ favorite songs. So i'm not the average listener.
I have nearly 2,000 in my MP3 library, with most duplicated on playlists with streamers. But I only have a few dozen, at most, of favorites. And that shows that each listener has slightly different tastes and preferences and radio, which is one-to-many, can only deal with the most broadly popular songs, old and new.
But i have to question if listeners who only like 17 songs out of the more than 100 current songs (not to mention, well... "recurrents & recent gold" + 1000s of other songs) are the ones who determine which songs are played.
If you were to go back to the days of 45's, you'd see that there was a huge sales number for the top few songs, big numbers for the next 10 to 15 and then it fell off to about nothing by song #30 or so on national Billboard, Cash Box or Record World charts.
There were plenty of songs that a few people bought, but the inference was that the "rest" were not buying because they either did not like the song all that much or they actually disliked it.
When stations research current music, they are not looking to play songs that a third of the audience likes while 2/3 hates it... they want songs that "everybody" at least likes and which most "love".