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

There are a couple approaches. Full blown high end audio racks with built in vibration control ($$$$$) and high quality sturdy racks to which you can add vibration control. When I have researched the topic before I always have come to the conclusion that the most cost effective route is great sturdy racks with enough space to add various vibration control devices under each component.

This allows approaching each component separately and spreads outlays over time. So, in my case I have an excellent Silent Running Audio custom Ohio Class vibration platform specifically designed for my turntable. While under the rest of my components I have combinations of Black Diamond Racing platforms, pucks, and springs. So, this approach really allows a lot of flexibility.

Top notch audio racks with sophisticated vibration control cost a lot.

I used to have BDI but saw the problem with glass. Went shopping, saw a lot of flimsy racks for a lot of money too! So I made my own, went with butcher block and threaded rod. On the base of threaded rod, have heavy duty casters. As for sound in between speakers, maybe the super critical would find something, but I don’t find an issue. For base of whole structure used super strut painted black. Super sturdy. Liked this instead of stone, cause then ur talking at least a thousand pounds 

Personally, I prefer the shelves in my rack to be decoupled from one another. I don't particularly see why the rack needs to be super stable horizontally since most of the problematic vibrations are traveling vertically. As with Ghdprentice, I also prefer to decouple the equipment from the shelves. If I had an unlimited budget, I would look at something like HRS but it would probably be cheaper to replace my suspended wood floor with concrete!

After deciding on the esthetics (with your SO, if applicable), I agree with @ghdprentice in the approach of finding a rack that provides a very stable platform for each component as well as the ability to treat the support of each component individually. 

Depending on the component, I use SRA Ohio+ platforms, a BDR shelf, Zoethecus Z-slabs, DIY constrained layer platforms, thick wood platforms, Herbies products, springs, and Hudson HiFi platinum silicone hemisphere footers.  In some cases, I decouple a stable shelf like a Z-slab from the rack and then further decouple the component from the shelf using the hemisphere footers, Herbies footers, or springs.  My three "racks" consist of either sturdy constructed quartersawn oak furniture (that I have heavily reinforced) or a Sound Anchor stand.  If you simply want sturdy, it is hard to beat Sound Anchor.  However, having a fully digital system, I know nothing about specific best practices for supporting a turntable.

I agree with tomic601, Core Audio equipment racks are the best I have ever used. They look fantastic, are extremely well built and provide unbelievable sonic isolation. Jumping up and down in front of my plyKraft 3L rack has no impact on cartridge tracking (Michell Engineering GyroDec, SME IV and Clearaudio Maestro V2 Ebony cartridge tracking at 2g). Not recommended, I tried kicking the rack once (stupid, I know), again no effect on cartridge tracking! Plus, Arnold Marr ( calls himself the "biG-wiG| principal") is a super nice guy to work with. In fact, he is delivering, and setting up, a custom double plyKraft 3L rack this weekend for me. Going forward I will be selling the single plyKraft 3L rack and custom TT shelf soon.