Because the job is more interesting than the alternatives? Because there is room for major career growth? Because the work/life balance is better? There are ton

Because the job is more interesting than the alternatives? Because there is room for major career growth? Because the work/life balance is better? There are tons of reasons it would be preferable to take a lower-paying job. Salary is by far not the only consideration (and for some, not even the most important one).