Perhaps a couple of factors that contribute are that there is no way to objectively measure the quality or utility of audio gear and the difficulty of making direct comparisons. Seems to me it’s similar to the wine market in that case.
If you’re in the market for a new car and live in any medium sized city you can test drive every car you can afford, compare specs measured by independent agencies and read reviews of the ones that appeal to you in dozens of online sites and magazines. Almost no one can replicate that when comparing audio gear.
With wine, as in audio, there are both huge corporations with huge advertising budgets and boutique wineries that depend on an appealing label and word of mouth, or word of online forum. As in audio, the big companies keep chugging along, mostly, as do some of the small ones that develop a great reputation and/or cult following, but many of the little companies don’t.