I have known the forum for a while, and it is very frequent to see many legendary activities. It can be seen that they spend a lot of time and energy to maintain the normal operation of the forum, and of course many legendary members are not staff. So I feel like they're all doing bitcoin full time. In fact, working in the decentralized financial field is a new form of work, which may be fully reflected in various DAO organizations in the future and will be rewarded accordingly. Many people will also say: You bought Bitcoin, put it there, forget about it, you dont need to work. It sounds ridiculous.
From my little experience and some responses I have read in some other threads, I can assume that most legendary members are into bitcoin on part-time bases. I am also aware that the staff in this forum a given little funds (don't know how much) just to appreciate them for their selfless service. Apart from earning from other sections of bitcoin like mining and other business aspect of the forum, signature campaigns might not be enough to earn a living in most countries. Some legendary members are successful professionals in different fields and they see the forum as a platform to learn and also enlighten others. The income from the forum is not also guaranteed because signature campaigns would not last for forever.