Maybe, but I'm still disappointed that since the rumors of a Rivers set started swirling last year and there was the possibility for it coming out at the end of 2010, instead we've seen reissues of Ellington and the MJQ. Not to denigrate those sets, but it just seems to me that the Rivers stuff, because it has been much less available, is far more significant musically and historically. As a huge Mosaic fan I want to see them continue to produce more sets in the mold of Braxton, Threadgill, and Carter/Bradford, among others. To me there's a lot more potential for growth there than there is in going over the more mainstream stuff from the 1950s and 1960s.
That said, I'll probably get the MJQ at some point because it is not music that I own (except for maybe one or two albums). But it doesn't generate the same kind of excitement for me as a Rivers set would have.
We have to remember that part of running a business - especially on the scale of Mosaic - is making sure that you stay in business.