If you wouldn't pay your taxes, you wouldn't be able to vote. Paying is one of the main part of our society, and I wish I'd see less HN'ers obsessing over anything with a price.
And many people pay taxes who don't have the right to vote.
Voting power is only loosely correlated with the amount of taxes paid.
Paying taxes is important but is orthogonal with the right to vote.
And in a lot of current countries, your vote is not linked to you paying taxes : for example in some countries very poor (and it's somewhat true of very rich as well) people pay little to no taxes, while sometimes getting a non negligible amount of money from the government, amounting to the opposite of paying taxes in a way. They still get a vote, exactly as valuable as one from someone paying a lot of taxes.
Just because American "democracy" removes the right to vote from individuals because of things they've done doesn't mean its right or even the typical behavior from a "democracy".
That means a single person with lots of money can literally buy their way over all others.