When I was quite active in a Camera Forum, I was unique as a poster when I was using legacy manual-focus lenses on a DSLR Body; typically, I was exchanging info with users of auto lenses and the latest-to-last-generation bodies.
When I moved to a MILC System, I was integrated into the mainstream posting, where the content made available was highly beneficial to my interests.
Running Parallel with this was the content of other Platforms where others with very good knowledge were offering educational information.
The Camera Forum content is substantially different to an Audio Content Forum, as Cameras are not really used in such a range of permutations and ancillaries being used are not really impacting the end results if techniques used are good.
With currently available adaptors, there is the option on certain bodies to add other brand lens models to another camera body brand, which will increase the permutations available but not really transform Photography in general, but will increase the chance to fill a lens gap in a Focal Length or Speed, if not offered from a preferred brand.
Individuals encountered are blatantly sponsored or blatantly not sponsored. How an individual receives remuneration for their time presenting is usually declared, and the party receiving information has their options to offer support clearly advertised.
An Audio System is typically an assembly of many brands from the base up, including Rack Support, Platforms, footers, Speaker Platforms/Stands, Footers for devices and footers for speakers, devices, Power Cables, and Interconnects.
Each of the above, if to get any time of airing in a Thread with an interested following, will be a new purchase price between $100 and $20K depending on the item being referred to. There are also items under $100 and over $20K, but this window selected is the mainstream and pretty much a common budget allowance.
There is money to be made; a Forum like the Gon is the Dawson City at the Klondike 100-ish years ago. There are lurkers, solely with an intent to create trade in Threads, but are not open with their agenda. There is blatant thread steering to the notion that a particular product has to be shortlisted or must be the top consideration period.
For that reason, I am on the Gon when steering is glaringly present; something different is going to be tabled. Members panning for a few gold flakes should be able to learn the best places to pan for their riches. Some will happily send one to Pan for their poor value Pyrite.