I was paid to write it, but still find it useful for short scripts and one liners. I'd use it over sed, awk or shell without pause.

It is very strong for text processing, particularly regexes.

Finally learning any language helps you learn new paradigms which you can apply anywhere. Same as Haskell or Lisp or something.

Things do not require to be useful or to increase revenue in order for them to be enjoyable. If the only reason you ever do something is because you get material wealth out of it, are you even making choices or are you a perfect rational actor as described in textbooks?

Things are allowed to exist and be enjoyed on the sole basis that they are enjoyable