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How does the blockchain ensure that I can both verify that my vote was counted but can't sell my vote? https://youtu.be/BYRTvoZ3Rho describes one electronic voting system that's supposed to have those important properties, even though I don't fully all the details yet.

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Depends on the specific implementation. Just because you do it on a blockchain doesn't mean you can't require people to show up to a polling center and sign transactions in person.

With Ethereum, one way to do it is to make the voting weight non-transferable, meaning to give someone else your vote you'd need to give your private key.

It would be of course crazy to do that; like giving someone your bank card and PIN number to give them cash.

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