Good question. Rather like beeswax, it’s the old principle of finding someone prepared to pay for it and what you are prepared to collect and sell it for. Personally I have never been asked for it either tho a colleague sucks on it when they get a cold and swears by it. I suspect the value depends on purity as well, old frame scrapings may not cut some applications. I have tried it myself and lived.
I remember there was a commercial operation offering a market some years ago but required a substantial free sample sent first to “test”before potentially paying for further supplies. Yeah right, pal.
I have not tried tinctures. Medicines and cosmetics (understandably) have a prodigious regulatory framework, which dissuaded me from going down that route.