So, what do these tables do that a $30K table cannot do?
Retail price has nothing to do with it. Many manufacturers use ridiculous amounts of markup because people think that if it is more expensive, it must be better. Also, the large margins offered makes it very appealing for distributors. There are tables that I have heard that are 5k that sound better than others at the much higher prices.
I do not want to offend anyone who owns the TechDas, but between the two you mentioned, I greatly preferred the sound of the Walker. When setup properly, it is a very good sounding system.