Hmmmm, not sure how to answer that question? I have 100's of LP's, hundreds of RBCD's and probably a hundred or so SACD's and I listen to all of them, but I'm not sure I can say what actual percentages would be? Music is a huge part of my lifestyle, so I'm more concerned with the performance and the music itself than anything else. SACD's always shine through relative to sound quality next to RBCD, but that's not to say that RBCD's are chopped liver and I don't like them! On the contrary, I think there are some FANTASTIC sounding RBCD's. Ultimately, good music is good music. I listen to a lot of different flavors; rock, jazz, lots of classical. With all genre's, higher rez digital media like SACD's always impress.
You mentioned before that you like classical music; may I suggest that you visit arkivmusik dot com and check out the SACD's they have available... I think you'll answer your concerns about performances, artists and availability.
As John says, don't talk yourself into something that you don't really want and won't value out of. If for you, pure RBCD is the way to go and that's what will make you happy, then that's what matters! I'm obviously a big proponent of SACD, but that doesn't invalidate another direction.
Happy listeneing!