Me and my roommate got into bitcoin sometime before I graduated college, around 2011. Unfortunately our gear was weak and we barely got anything done - we couldn't afford the electric bill and had to stop. I didn't pay much attention after that due to the fact I was extremely broke and barely affording the room I was renting. Other than mining a little feathercoin for a brief time I lost track of crypto.
Last year my old roommate whom I've kept in touch with reached out and reminded me about it - he had kept up with it more as a hobby and had actually made out okay. I decided now that I have a job and career and money to spare - a hobby would be a good thing! and I'm glad I did built a mining rig within a week.
I didn't make out like a bandit in 2017 as some people did (my friend bought himself a nice new house) I just did okay. More importantly it really gave me something to dig into - not just a chase for money but all the potential. I go off on tangents when someone gives me the opportunity to explain some facets of crypto, all the different consensus models etc etc.
For me - at least right now its something to keep me from just doing the same thing everyday, getting off work and only playing a video game, or immediately going to the bar. Those things are great I'm just happy to have something else to fill my time that might also be knowledge worth obtaining
sorry this was long