> It's a kind of a coding competition, indeed.
This is referring to demo parties specifically. Let's not forget the social aspects of them though. Yes, a selected few went to parties to "compete" in their chosen art, some might have even taken them quite seriously. But they were the minority.
The bulk of the attendees just went for fun and company, and did not create anything. Demoparties _were indeed_ parties back in the 90s, with people playing games, drinking and socializing in general. You could argue these were like rave parties, only a bit quieter and much friendlier / inclusive (ok, maybe I am biased, but it certainly felt that way).
It was lacking in one aspect though - not many girls attended, and so as time passed these parties were becoming less attractive. But that did not stop anyone going home and downloading and admiring the products of demosceners, who did all this basically in their free time, for not much (if at all) compensation.