How important is a good rack?

The Audio Beat's review of "The Scuttle" rack states that Silent Running decided it was "time to make an affordable rack" so they pitched the basic model at $6600 upwards.

Some vendors have a skewed understanding of the word "affordable"....

I compare equipment racks to loudspeaker cabinets in that the most cost effective solution is to minimize them with the ultimate goal of getting rid of them completely. If the goal is to prevent outside vibration from influencing equipment, then footer and spikes take priority over a rack. That said, equipment racks have a high convenience value and some are very visually appealing.

Yes, I take your point but the context of this discussion is turntable related. Not many people wish to get down on all fours to load the next LP. ;^)

By way of example, my rack was custom built by the manufacturer (I was the first customer to ask him to make a tripod arrangement) so he drafted it to my dimensions on a CAD system, sent me some dimensioned visualisation files for approval then made the rack for less than 1/10th of the price which Silent Running's cheapest rack is costing.
Good VFM?

Very important jump on a Symposium Isis ASAP!

Rack suggestions are very subjective.
I don't know of anyone personally that has done a comparison of racks in the same room at the same time. I'm sure that would be interesting and difficult to do.