Audio Racks, Just How beneficial? looking for guidance in upgrading

Greetings all. Looking for guidance and your experience in racks & shelves for the ’sweet spot’ and upgrading. Do you find that applying a percentage of your total system’s value of perhaps 5% or even 10% is a good metric? Do you folks find that some of the leading Audio Rack companies, like HRS, CMS for ex., which seem great but is it beneficial to warrant spending well over $15k , $10k + or $5K on vibration isolation for a mid level system. Racks are really hard to demo; I’m reaching out to Audiogon community.

I’m trying to get my arms around some of the price points and the cost/benefits.
Anyone find wood is sonically better?
Doesn’t seem to be that much between A/V furniture manufactures and the better companies. Prefer a Modular approach like Bassoconuinuo- (anyone have it? I haven’t priced it yet.) or adjustable shelves. (not that keen on Solid Steel).
I need 6 shelves including top for turntable.
Currently have a BDI with glass shelves; using still points, or BDR cones, maple butcher blocks. Yes, I know the glass shelves...have to go.
Thanks!