Comment by wanderingmind

Most PhDs fit these category and yet they are miserable financially, physically, emotionally. At the core, we need to be doing something that is useful to a significant number of people in atleast one way be it physically, financially, cognitively or emotionally. Yet most of these expertise demonstrated in thick jacketed thesis books just collects dust with no tangible use. So, no don't become an expert in something specific and boring unless it has the potential to be useful for a significant number of people.