It's odd only if you have not tasted it. Once you have the experience of work with a sense of purpose, working without it (if you're skilled enough to be in a position to choose) looks like an odd life choice.

I have done work I though was important, as in saving lives etc. But, it's not like I am the only person that can do this stuff. Really when someone else is paying you they could pay thousands or possibly millions of other people to do that job. The fact you happen to be the one doing it is not really important other than a sense you should not mess up.