Mosaic's release policy has been discussed here many times, and people tend to forget that they can't afford releases anymore that are not expected to sell well. Their Select series was terminated because it was not economically viable; same with LP sets. There's also the problem of licensing issues, especially when artists recorded for many different labels with different owners, who are often reluctant to license those recordings to be collected in one set - case in point: a Mary Lou Williams set; that will probably never happen, just because her recordings are all over the place. People have also often wondered why downloads are not offered by Mosaic - simple, rights owners refuse to license downloads to Mosaic.