What is knowledge for?

Do you ever think that knowledge is really needed to get a job? What if a person gave you job with a payment of 20k per month without paying you food and rent. Will you take the job or continued your study? Even if you choose knowledge, who are studying for? I get this question by a friend from a center. He ask all my classmates in the tuition and a lot of them need a lot of time to think and also having a hard time thinking. So? What do you all think?