No state has a 30% plus sales tax on every single good and service. Florida tried to put a sales tax on services and abandoned it as unworkable.
If you are going to push the plan, then you need to consider that people might take action to avoid such a high tax, and figure out what that will do to revenue.
Since low tax revenue that will trigger an automatic hike in the tax rate, causing more evasion, I would suggest as an engineer that the feedback in this system is totally unstable.
you make mistatements in your arguements. The fairtax is proposed at 23% of goods, not over 30%. Who said services too? And you fail to mention all of the billions of spending that the underground people will be paying into the system because they will be forced to pay to by their goods.