TH wrote several news articles about the XMIT Hall Effect RGB keyboard. The question is not "Why are there so many commodity keyboards?" but rather, "Why do you keep reviewing commodity keyboards when you have something much more interesting lying around?"
That's a fair question. The answer is nuanced. Our goal as a publication is not simply to review the coolest stuff; we want to examine as much of each market as possible--the gear people are spending their hard-earned money on, and the gear that stands out as truly remarkable. Sometimes that means reviewing less sexy gear--as you (probably correctly) call them, "commodity keyboards". Because maybe the commodity stuff is actually really great. Maybe it's garbage. But we won't know until we review them, and in the meantime, people are buying them.
Further, we're not just in the business of reviews, we're in the business of *comparative* reviews. So taking a look at a bigger range of the market means we can do a better job of comparing these devices to one another.
Finally, fear not--there's more diversity and some really interesting stuff coming soon.
And we'll put the XMIT Hall Effect in the queue as soon as he sends me one!