Because it sounds good, has great tone-shaping ability, and has sufficient volume for many applications. My stack is a two amp config. Crate combo plus a Hartke HA2000 into a 4x10. I just pulled the Crate, and replaced it with my bassist's GK800RB which feeds another 4x10. And guess what?? The Crate based rig sounds better, and is nearly as loud.