There is another aspect to this debate which has nothing to do with the sound or musical qualities of audio gear but everything to do with the psychological make up of the listener. I find it enough of a PITA sometimes being into vinyl and constantly worrying about scratches/fingerprints/dust/worn or (horror) chipped styli but to add in another set of variables in the form of toobs would freak me out no end. I know I'm being neurotic but I just couldn't live with a valve amp forever fretting over such things as has the bias drifted, was that valve glowing that bright yesterday, did it take this long to warm up etc etc.
Obviously if none of this bothers you then fine but the major trauma I've just been through having to get my pre amp recapped (it's 11 years old) no sir not for me I'd be a jibbering wreck within a week of owning a valve amp.

Cheers
Mr. Sandman, sorry, Ralph