[lojack]

If you're a developer making six figures and aren't really interested in staying up to date with current trends or becoming a better developer, then it may be a waste of time. This attitude may come back to bite you in the ass in ten years when you're looking for a new job and find that your skills are no longer applicable to the modern workforce.

I will say that it's virtually impossible to be purely an OOP programmer without using ideas that originated with imperative or functional languages. It's also pretty difficult to be a really good OOP developer without writing at least some code that looks very functional. There's a lot of ideas and techniques that help you as a developer no matter what paradigm you choose.