>>127632011 (OP)
because they hated each other and were unprofessional in letting it show onstage.
During the monsters of rock in 1988, EVH even sat George Lynch down and was like "look I fucking hated DLR but when we were onstage we looked like the best buddies in the world. It's a show, put on a show."
Dokken also had the very unenviable task of going on right after the then-very-hungry Metallica, who had just completely obliterated the crowd in the middle of a hot summer day, every day on that tour.
I was there, it was spectacular. Poor Dokken, everyone was just wrung out after Metallica. So we all went and had beer and chilled out waiting for the Scorpions.