I have always found it strange that Frank's stuff, which has a dedicated cult following and a 30+ year history gets so few reviews. It is stranger still because every review I've seen to date has been positive.
If I'm a reviewer, reviewing the latest ultra-megabuck gear tells people I'm a force to be reckoned with. Price = status. Add in exclusivity too.
So once I get done with that, then I have to also review some of the stuff from well-known names to show I can review as well as everyone else, and also because people expect it.
What time, energy, and space gets left over can go to other brands, and that probably isn't much.
It's a bit like any journalism. If I have the pull, I can do a report on my interview with the President or other head of state. Or I can do my interview with Joe Dokes who runs the local bowling alley. Joe may have much more to say, and be more intelligent and lucid than the President, but my career sure will go farther if I go with the Pres. More people will probably read, watch, whatever if I do the Pres. too.
Not all audio reviewers are like this, but you can bet that some are.