I was only referring to the tight playlist when saying "the KRTH formula", I agree that playing all the minor New Wave hits that KRTH does is something that wouldn't work out anywhere else. While I understand that different markets have different listening patterns, the fact that KRTH is a rare station in its format to consistently rank so high in 25-54 and 18-49 makes me think that other stations in the format should take the tight playlist approach to their playlist. I will concede that it could simply be a matter of other Classic Hits stations finding the minor hits that work well for their market, like KRTH with New Wave, without tightening the playlist. I will also concede that since Classic Hits is mainly a 35-54 format, stations in the format that consistently rank top 3 in 35-54 could make money even if they're only around 7th in 25-54. Regardless, KRTH's success in 25-54 and 18-49 is something I find very interesting, given that Classic Hits stations are notorious for not ranking as highly in 25-54 as they do in 6+A tight playlist approach works best in markets where there is a lot of short-term listening several times a day. And even that is a challenge because you need to set scheduling rules to have the largest gap possible between plays of any one song at the same approximate time (and keep a close eye on that when reviewing the music log before sending it to the automation). Markets with longer listening spans need to use a different philosophy.
Also, to extrapolate from what Vic said above, KRTH draws on the 80s heritage of KROQ and plays a lot of New Wave songs that get little or no spins in other markets (I can confirm this based on my own use of airplay databases). In the vast majority of markets, those songs are relegated to weekend specials, whereas on KRTH they are in regular rotation.