Right, but if they just started at that job, and they previously had worked for much lower pay, they wouldn't be exposed to indoor rock climbing much at all. I

Right, but if they just started at that job, and they previously had worked for much lower pay, they wouldn't be exposed to indoor rock climbing much at all. I don't think the author is saying that they couldn't rock climb if they wanted to, it's just a very different context when people can suddenly have (relatively) expensive hobbies.