Because once you understand type theory, you unlock the ability to win arguments on the internet using words like "monoid" and "dependent elimination". Also, it's comforting to know that while your life may lack structure, your types never will.
To give a non-cynical answer: a good reason to look at type theory - if you’ve been exposed to computer science - is that it treats syntax and syntactical manipulation as foundational and can be viewed as the branch of mathematics that ties syntax and with the notion of computation.
And anyone who thinks their own area doesn't have jargon has just forgotten how to recognize it.