BAT VK500 (main system) and Classe DR-8 (office system), both systems are using BAT tubed preamps. I haven't bought a Gallo amp yet, the bass response is fine as is. Knowing me I'll end up with a Gallo amp sooner or later just cuz I can't seem to leave well enough alone :)
As to why nine people are selling 'em, I suppose they want to try something else. Gallo has sold a lot of Ref 3's so nine used pairs isn't much percentage-wise.