Marshall dropped bass amps a decade back unfortunately. The last one was their best, the VBA 400, but it was not distributed well enough in the US, so interested bass players could never find them in stores and where they actually were shipped, sold so fast that the market remained unserviced.
You can't buy what you can't find or try. Europe seemed to get a decent supply and bass players spoke highly of them, but the lucrative US market is what assures success and that underservicing, also coinciding during the last of Jim Marshalls years, fell short.
Jim was a dedicated marketer and supporter of his products and the market it was created for. He looked after me when I had an amp issue once, buying the amp back at full price to help me as he didn't want defective product recircling in the market. He was protective of the Marshall name as you'd expect.
I still use Marshall's as my main amps and have no intention of ever changing.