I don't hear it much any more, but I heard Rock Bottom *all the freakin time* on rock radio when I was growing up.
But I think Seattle is just weird that way. They also played the crap out of Sammy Hagar *WAY* before "I Can't Drive 55" was a hit.
I constantly heard "Can't Get Loose", "Baby's On Fire", "Heavy Metal", "I'll Fall In Love Again", "Remember the Heroes", "Three Lock Box", "Your Love Is Driving Me Crazy", "I Don't Need Love", "Red", and "This Planet's On Fire (Burn In Hell)" in the early 80's. All of these were pretty much regular rotation songs.
But ya....Rock Bottom. Heard that a lot.