Of course people want a meaningful job to some extent. According to Herzberg's dual-factor theory, challenging or meaningful work is a motivator that gives positive satisfaction in the workplace. But Herzberg successfully identified that the hygiene factors such as salary (meaningful in the 'transaction' sense of a job) are much more important.

'Transacting your time and expertise for money' is one of the main drivers for working (a hygiene factor), 'fulfill a mission' is merely a motivator. We have known and taught this to managers since the 70s.

A competent employer will of course know about this - be it through having competently trained management or just experience. Managers know that some candidates are completely happy with a high hygiene + low motivation mix. In some situations, this is completely fine and not 'acting like a sourpuss' as you describe it.