Good point Serge; pharmaceutical companies sell medicinal therapeutical ethical drugs for the well being of humanity...healing. And they have to pay taxes too, or their CEOs wouldn't make the money they make. Marijuana is legal in some states, and they pay taxes. Vaping and smoking (tobacco)...you pay taxes, to our government.
Audio gear on the used market; the tax collectors aren't interested in second-hand audiophiles, do they?
There is tons of money to be made right now; check your finances, make a plan, invest in the right places...e-commerce, vaccin companies, cryptocurrency, high-end audio paranophelia, wiring, luxury yachts, real estate, hypercars, castles, mansions, private islands, YouTube, Instagram, Apple, Amazon, ...
Typically luxury items such as yachts, hypercars, high end audio, are not exactly an investment but that's not to say they can't be a source of revenue. Yacht chartering such as UpYacht, BoatBookings, etc... and TURO, HyreCars for cars. I am not familiar with details of such but know they exist and people do it to either offset the cost, break even or perhaps even make some money over time.
High End audio? Well, at one point I actually thought of creating a high end audio leasing model but keep it as an exclusive, small operation for special clients that I could trust. One thing we know about audio is that people like to upgrade and play much more often than they want to actually keep any of their gear.
So why make them purchase an expensive pair of speakers (Like the new Wilson AlexxV $125k) or a that fancy new Boulder amp when they can play with them for six months to a year and it would cost much less than they would be selling them at a depreciated, typical preowned audio prices and not having had to tie up a large chunk of money that could have been invested into an assets that has the potential to appreciate over time? The leasing/sharing models work very well for other depreciating class items and are popular, so why not high end audio for high end clients?

As the gear ages, the leasing numbers would adjust lower and be accessible to a larger pool of clients... :evil: Pretty sure the idea would work very well in certain markets that have a concentration of wealth and lifestyles where luxury items are well, a necessary component for a happy life...
Of course that business model requires a much more substantial, up-front investment to get going compared to a traditional retail model where all the profit is available at the point of sale.
I have always thought I could put my money to better use elsewhere. But for an established store with many wealthy clients???
Mike?
Islands are beyond my scope of knowledge or ideas... Never thought of it but the few who own them, seem to be doing very well?
10 Richest Private Island Owners | TheRichest.
One thing for sure. Beachfront properties are a sure bet long term investment. They just don't make more waterfront/beach property. When some of the investors started hinting at Puerto Rico... that was a good time to jump on it as their prices were depressed. I hesitated, thinking I don't want those headaches with the hurricanes and all that... and of course that has market has exploded as of late .
Manmade islands are no longer sci-fi of course, it is quite within the reach and has been done (Palm Islands Dubai). Maybe the idea will catch on someday in many other places and that will create new and perhaps even more exclusive/expensive beachfront properties?