That's sort of my situation. Actually, I just counted and I have 13 sets. Some are sets where I was familiar with the artist and figured I couldn't go wrong -- e.g., J.J. Johnson, Sonny Stitt, Hank Mobley -- and others I was less familiar with a musician's work, but listened to samples and figured I would take a chance -- e.g., Woody Shaw, Tristano/Konitz Marsh, Jazz Crusaders.
I don't think I would say that "I'm just getting started." Actually I've been playing and listening to jazz for some time. It's just that my buying habits are fairly haphazard. I suppose maybe I could sell some of the Mosaics and use the money for some other "essential" CDs, but I don't see much purpose in that, because the music is generally great. I guess the better course is probably to start buying more single CDs and only jump to a Mosaic if there is something I'm interested in that's in danger of going OOP. I would love the Buddy Rich and upcoming Dizzy Gillespie sets, for example, but they will obviously be around for a while. The Selects also seem like they would be a good way to explore a new artist or more of a familiar musician.
I don't know why. I just seem to get drawn to those big black and white boxes