Why should paying taxes be a requirement? If laws and issues are going to effect you, you have the right to have a say. Income, which is what this amounts to, disenfranchised all those who's income falls below a taxable rate and essentially creates two distinct classes of citizens. The elite, who are allowed to vote and the rest, who are not yet sustained pay taxes on purchases, have children in schools, and must what the elite decides. They have skin in the game, you've just removed their voice.