You mean therare no dishonest businessmen? Why does the IRS exist anyway since everyone pays their fair share without dodging any laws, right?
The IRS has bred dishonesty since its inception. The withholding system is a "taking" of wages, something the Founders had no intention of doing. Only profits were supposed to be taxed, and wages ain't profit.
The record keeping and IT infrastructure is already in place.
You can't evade a state sales tax, any more than you can evade a National Sales Tax.