I don't think I have anywhere near the knowledge of most Legendary members here about bitcoin, but that isn't one of the criteria for getting to that rank.  In my case, all it took was time and posting--now it takes merits as well.  I would argue that you don't have to be a mechanic in order to be a high-ranked member of a forum about cars, just interested enough in cars (or the forum) to stick around long enough to get whatever rank we're talking about.

I could care less if higher-ranked members have excellent technical knowledge of bitcoin.  In general, they do, because there are a lot of young folks who seem very educated in mathematics and computers.  But all you really need here is an interest in bitcoin, which I'd say pretty much everyone has except for the worst shitposters.  They're just here to sap money out of whatever bounty they can and probably don't have a genuine interest in anything crypto-related.  And usually they don't advance in the ranks.