The federal sales tax alone will be 30%. No one in history has every successfully implimented a 30% broad sales tax on goods and services. Avoidance will be huge. Studies in Europe suggest anything over 10% causes a significant amount of avoidance.
Avoidance is figured into the 23%/30% rate -- assumes equivalent to income tax avoidance (off the top of my head, I think that's roughly 15-20%).
There ain't no such thing as a tax system of any stripe where some people won't try to game or cheat the system. The fact that some poeple will try is not a good argument against a particular system.