I am absolutely serious. Any employment has opportunity costs: a person who writes and sends out cold call spam e-mail for 8 hours a day is a person who could be spending those 8 hours on something else, but isn't. Yes, switching jobs is not very easy, and it's stressful but humans, thankfully, are not (yet) a species of highly-specialized individuals, with distinct morphological differences that heavily determine the jobs they potentially can or can not do.