The first time I interested in bitcoin is because it offer a great side income for me, but after I knew bitcoin for a long time now I see bitcoin as a currency and investment, I see so many potential in crypto currencies i believe in the future crypto will be a very useful currency
Same as the above statement I too got into bitcoin considering it an additional earning. Soon after that in a short it gave the knowledge and got interested to know more. Now I give importance as a earning, investment and mainly for gambling need.
I think that is the majority why we are here (extra income, sideline job). Everybody wants to earn and that's why they are putting so much force on the keyboard or keypad just to type constructive posts even in late hours. But I think some people here are here because they want to learn something more especially the programmers. We all have a various of reason why we are here but the good thing is we all support the community.
Well at first was, as with probably some more people here, the thought of getting some quick big money and yes those were the faucets back then lol but as the time passed, I've became interested in cryptography, programming and trading. So now that's my main hobby, and also provides me some money on the side to cover some bills. :p
So overall, from quick money to an interesting hobby.
The three fields you mentioned is in of the best way to earn more but hardest to learn, especially cryptography and programming, well I'm in electrical engineering field so I've only learned basic programming but I can solve the electricity cost. That's a nice move, you've learned something that beyond your expertise. It is a reminder that it's never too late to learn and the excuse like "I don't know how is just an excuse".