This can be explained by the fact that it's clearly a communal sport, though practiced individually. The social and sharing aspect is clearly a part of the sport.

Is commenting on this thread also "attention seeking," because no one does so without making their comments public? Or is it a form of social behavior?

> What percentage of these people do you think do this and then DON'T post an image / video of it somewhere to get views? I would guess it rounds down to 0%.

What, just because you haven't seen it? (But seriously, how would we know? You're talking about a group that, by definition, would leave us no evidence to discuss their existence)