@lonemountain wrote: "Finding something unique to sell is the game."
I agree.
I started out twenty-five years ago as a dealer for SoundLab speakers and Atma-Sphere amps & preamps. In the five years I was a dealer in New Orleans I only made ONE local sale of SoundLab speakers, but I made many sales to customers who flew in for an audition. I paid for their stay in a bed & breakfast, and re-imbursed their airfare if they made a SoundLab purchase. There were other lines I picked up over the years but those two have remained my core. When I added my own line of speakers about eighteen years ago (after my brick-and-mortar burned down before opening), compatibility with Atma-Sphere’s OTL amps was a priority.
I still had to diversify when the economy tanked in 2008-2009 because people largely stopped buying "expensive toys". So I started making bass guitar cabs, figuring they were a "tool of the trade" and would fall into a different category. Again I was lucky, as enough bass players liked what I was doing that they were willing to pay the "boutique" prices I have to charge.
I’ve also done a few custom studio monitors, in collaboration with a professional acoustician.
My point being, offering sufficiently unique products has worked for me. Not that I’m making the big bucks, but I have been able to do something I love and still pay the bills.