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There are things in life other than money, and people you can make happy in ways you never could with an extra couple of hundred thousand a year. We're social creatures, by and large - if you're trading away your time spent being part of society for some extra money, unless you're a certain type of person, you're almost definitely making yourself less happy - and if many people do it, they're making everyone else less happy as well as people have less opportunity to socialise and are more pressured into a game of increasing a number.