There are actually many false assumptions that go into this calculation, including a generic utilitarianism, but even without arguing the particular points, the claim that you do as much good for the world by voting as by donating half a million to charity is absurd on its face.
Because of the particular points, however, I would also disagree that your vote is worth anything like $5,000. And I suspect the vast majority of people, if they could sell their vote, in a one-off situation where no one else could sell theirs, and no one would ever find out etc., would be happy to sell their vote to the party most opposed to their opinions for $5,000 (or for much less, for that matter.)
There are actually many false assumptions that go into this calculation, including a generic utilitarianism, but even without arguing the particular points, the claim that you do as much good for the world by voting as by donating half a million to charity is absurd on its face.
Because of the particular points, however, I would also disagree that your vote is worth anything like $5,000. And I suspect the vast majority of people, if they could sell their vote, in a one-off situation where no one else could sell theirs, and no one would ever find out etc., would be happy to sell their vote to the party most opposed to their opinions for $5,000 (or for much less, for that matter.)