First off, no I dont buy Puff Daddy or 50 Cent records because I dont like that style of music. I'm not going to sit here and say they are lame or they suck just because I dont like them. Hell, they are well known around the world so i'm betting they do their rap hip/hop stuff well.
As for your friends listening to The Kaiser Chiefs/Snow Patrol/The Killers/Scissor Sisters and so forth,,,,I find that odd seeing as how your profile states your 48 years old (I dont know that for sure). Arent these bands what teenagers and younger adults listen to? I dont know because i've never heard of them (well I do have a Killers CD that was given to me by my nephew and I didnt care for it to much). Anyways, i'm 37 and none of my friends listen to that kind of music that i'm aware of.
As a Beatle fan, i'm not pushing for my friends to buy McCartneys new one either (or his older stuff for that reason). Most of my friends wouldnt buy it because they know i'm going to own it and they'll listen to it with me. If they like it well enough, they'll go buy it. Simple as that, but to be honest only a couple ever do so I get your point. As for being a Beatle evangelist, I understand this too. I stand up for them if somebody bashes them, but I realize that more people probably dont like them then do anymore. Oh well.
I'm one of those people that would rather listen to the solo stuff than the actual Beatles anymore. I'm flat burned out on the band themselves. I'd much rather listen to Pauls, Ringo's, or Georges solo stuff as theres more variety (I dont care for Johns solo stuff that much). I've been this way for the last 15 years or so.
We're just entirely different people, but sometimes I just dont understand people making a decisions on music before its even released. Its like telling somebody you dont like liver and onions, but you never tried it.