After a contractor decided on a radical life change and moved to a different country, leaving us without anyone with his skill set, my old manager used to joke

After a contractor decided on a radical life change and moved to a different country, leaving us without anyone with his skill set, my old manager used to joke that he should only hire people who have a mortgage, because they'll never leave on their own. Funny as a joke, but a bit chilling when it's given as real advice.