In order to become an expert in the population it requires a mastery that is hard. It requires a few orders of magnitude more effort with less and less reward as you become more and more competent.
Collectors of basic intro knowledge could be looking for something they enjoy but there are a large portion of people who do it because it feels good to learn. This is a trap for smarter people and I'm sure everyone knows the career academic with a multitude of academic degrees or a friend with a new hobby every month.
I think everyone should try to be a in the top 1-10% of some pursuit at some point in their lives to see the amount of effort and planning it takes to be at the top of something. You don't have to stay at the top. It makes you appreciate the people at the top of things more because you more easily recognize the effort it takes to be great. Too much of society is focused on the natural ability or luck involved to be at the top. It could be argued that a PHD is this, but I believe that its sort of forced because there are economic and structural motivations that are available that aren't the same as only having a personal motiviation.