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That entirely depends on how you value a vote. If you assume that the only thing that matters is the majority, then votes in some places make more difference than others. But this approach ignores the substantial data operations that parties are now running. The Conservatives aren't putting out policies friendly to old white people because they're the party of old white people. They're doing it because they vote and vote reliably. By at least putting a ballot paper in the box, regardless of whether or not you cast a valid vote or drew a massive cock, there's a record that you voted, and the parties know that someone like you voted. It sends a signal that your vote is on the market for anyone that cares to woo you.
In 2010, the under-30s outnumbered the over-65s by around a million, but the latter outvoted the former by over three million. Of the eligible under-30s, around two-thirds were registered to vote, and half of those turned out. Of the eligible over-65s, almost all were registered and around three-quarters of those turned out. Theresa May is appealing to old people, who vote in large numbers, and Kippers, who are highly motivated. Jeremy Corbyn is most popular with the young, who by and large don't vote. Which of those strategies is likely to pay off?
In short, if you think you're getting a bad deal, and you don't vote, then the two are probably related.