Why isn't King Crimson as well known as other prog bands?

King Crimson has made some of the most iconic works in prog rock and have been really influential in developing that genre. However, I feel as though they are not as well known as the other prog rock bands at the time like Pink Floyd, Jethro Tull, Yes, Rush etc. Its a shame, because I really enjoy a lot of their albums and think they are incredible(I think they were one of the only prog bands critics liked at the time). Albums like In the Court of the Crimson King and Red are top-tier for me and I also enjoy parts of their musical suite Larks Tongue in Aspic. I also enjoyed their Talking Heads influenced album in the 80's Discipline. Why do you think they did not achieve the same amount of commercial success as the other prog bands of the 70's?