Quote from TGregg:
Not defending the lawbreakers, nor am I in favor of higher taxes, but catching the cheats may have an even more detrimental effect on the economy than simply raising taxes. Chasing down and punishing lawbreakers costs money and resources.
This is why sales tax + luxury purchase tax works better than income taxes...in any state or country. You can hide income in many different places but you can't hide it from the cash register. If you are rich you want to live rich and thus have to pay the taxes for doing so. If you are poor you pay very little tax since you don't have much to spend....but EVERYONE pays.