Why is there only very expensive manufacturers making shelving and consoles for high-end audio equipment
Amplifiers preamps etc?
What is 'high end'? What are the requirements for the equipment in use?
I always hit Wayfair before any other place if I am not using a Middle Atlantic equipment rack (which I often do).
Wayfair has a ton of different styles at a ton of different price points, almost all of which is perfectly fine for most gear that is in use. They do have 'high end' (re: expensive) stuff, but often there are less expensive knock offs which will work just fine as well.
I truly don't understand what the real question is overall. I mean, for $150, you can get something like this, which holds 75 pounds per shelf...
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I'm sure you could go over a few pounds with no issue.
But, once you get into really good woodworking, you are going to see prices skyrocket as it actually is expensive to get good wooden products with quality craftmanship in use. I think if someone has high end gear, then they shouldn't really be complaining about getting appropriate furniture to go along with it which shows it off and blends to their environment properly.
It's not like Middle Atlantic is 'cheap' as custom rackshelves run about $150 per custom shelf. So, a receiver, amplifier, cable box, media streamer, etc. easily rack up $600+ in custom shelving right out of the gate. But, it looks cool when all is said and done.