So the average value of a vote is in the area of $10,000.

That's a meaningless phrase. You want to buy my vote for $10,000? No? Who is going to buy it, then?

Not to mention that when you're calculating "affecting spending" you need to look not at the total number, but at the marginal difference between Hillary and Trump plus weight that difference by your values.

The rational solution to a tragedy of the commons is not to defect.

In which way is it a rational solution if you're the only one doing that?