Some of these brands rarely appear here. Maybe the customers are satisfied for life? - Boulder (I only saw at most 5 times) - Rockport (saw a Sirius TT once, the gigantic speakers once) - Walker - Spectral (okay, maybe this is not so rare...)
I think in the case of some of these brands (at least the first 3 in the original post) they simply do not produce a lot of gear. They are big ticket, built to order, once in a lifetime purchases.
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