Entry-level gear drives affiliate sales. Sounds harsh to say but you’re a lot more likely to sell hundreds of HD 560s through affiliate sales than you are a pair of $2k cans. Entry-level gear also tends to have a much larger reach than the more niche high-end gear so it will reach a larger audience.
Outside of reviewers though, oftentimes whatever FOTM legend killer that gets released is the first pair of “good” headphones that someone with no frame of reference buys. So to them, the headphones are the best thing in the world.
I often tune out when FOTM reviews get praise like “competes with headphones in the $1k range” . Often times the person hasn’t actually heard anything in that range and without any context it’s still useless. Does the KZ 64 driver IEM compete with the Shure SE846 in the $1k price range or the Campfire Audio Andromeda? The Thieauio Monarch is up there in that price range so does it compete with that?
It’s why most opinions on the internet that you read aren’t very useful unless you have a frame of reference behind them.
I personally found the HD 560s to be in an appropriate spot. You get pretty good sound, guaranteed warranty and good customer service (depending on who you buy from). I still stand by my original impressions as its a toss up between these and the 6XX depending on what you’re looking for.