I'll second that- the tri-tone eq is not really intuitive, and the MFD's are so powerful they can overwhelm.
But once you get dialed in to what a G&L can do, it's pretty spectacular. They lay right in the mix; Leo outdid himself with these basses.
Their build is extraordinary, every detail is first-class-electronics, wood, components, finish- As good as anything; better than most!
As far as the low key under-the-radar marketing and promotion, I personally dig it. G&L/BBE keeps it small and hand-built, not massively produced, and the line (to a lot of G&L fans chagrin) has remained pretty static. That's OK with me, I like it that way. Keeps quality standards high.
To the OP's original question---
All that probably keeps resale low, not a lot of "sizzle" with these basses, just a rock-solid player's bass built to the highest standards!! That's a good thing, especially if you're looking to buy used- I've seen some very low prices listed.
OR---you can always order new from the Factory, and put
together some finishes and options to your liking, such as I did with my ASAT. One of my favorite instruments, always a pelasure for me to play.