Those came out in 2008. They must not have sold that well if nothing has been done in 12 years. But Epic releases Mike compilations such as Scream. Japan reissues albums by lesser known American acts that are out of print in the USA including 1970s funk bands and R&B singers. So I would not really count the Japanese as a gauge for what happens elsewhere. Look at The Beatles, they get stuff released regularly, and not only their records. They have movies based on their music (Across The Universe, Yesterday), documentaries, board games, dolls, toys, video games, books, etc. There's even a documentaries about Stuart Sutcliffe & Brian Epstein and a biopic about John Lennon as a teenager. They still get written about in magazines and talked about on TV. That's free publicity. That would not happen if The Beatles didn't continue to be really popular in the mainstream. It's called the record business for a reason. It's not like Herman's Hermits or Freddie & The Dreamers get the same amount of publicity as the Fabs do today. Elvis Presley has a bunch of movies that are shown all the time on TV. Since most of them are musicals of some sort, that keeps his name and music out there. Some people just have more of a public demand than others.
It probably doesn't help that The Jacksons haven't had a record out since 1989. They weren't performing either until a few years ago. So they have been out of the public eye all that time. Most of their concerts have happened outside of the US though. It also doesn't help that people upload Jacksons/J5 songs on Youtube as "Michael Jackson".
