I watch a lot of Forensic Files, and one of the tropes is "the spouse had a $30k life insurance policy, therefore he/she had motive". I've always wondered who

I watch a lot of Forensic Files, and one of the tropes is "the spouse had a $30k life insurance policy, therefore he/she had motive". I've always wondered who is motivated to murder by as little as $30k. Sure you can murder for NON financial reasons, but if money is top of mind - $30k, really?