We literally get taxed out of 7/8 of our productivity. If the fed income tax disappeared (and by the way, we did without a fed income tax up until NINETEEN THIRTEEN), you'd see an economic boom that would dwarf anything you could imagine. And a consumption tax DOES catch all those involved in criminal activities, such as drug traffickers and whorehouses. They would finally pay taxes.
By the way, the "ultra wealthy" as you put it DON'T PAY INCOME TAXES. They have attorneys who figure out how to avoid that stuff. They don't earn WAGES.
You really need to get informed. If you're interested I could suggest some light reading which would open your eyes.