Profession? Is thievery a profession/hobby? Unless these hackers work against thieves I wouldn't call it a profession or hobby. It can be indeed very profitable if the hacker is skilled, but it never ends well when you take something that doesn't belong to you, there are serious consequences not only on the human law's sphere, but in a superior sphere as well.
Temporarily these thieves can think they are very successful, and they will indeed enjoy this money and their status, but on long term they will surely regret about doing this... Unfortunatelly, I believe in the future virtual crimes will become more common and it will help to spread fear among people when dealing with Crypto-Currency.
Stealing is not good at harming others, jobs that cannot be done by good people, stealing is not a hobby but a crime and worse than throwing garbage on the street, I agree with opinions, which are not allowed and strictly forbidden to enter the business world like cryptocurrencies, the issue is detrimental to the people can even harm the hacker, the rich need to struggle and not steal