This is overly cynical. The target demographic for a really complicated Vacheron Constantin is a rich person who is a HUGE nerd about watches. Think about people who get into really high levels of nerd hobbies and acquire super expensive gear. It's not primarily about showing off.
Not that I am wealthy enough to participate, but you see the same thing in cars and the same issue too. Sometimes status signalling and taste end up in the same product, and people who don't care about cars end up with the finest of the cars, almost coincidentally.
I'm not sure buying the super fancy handbag is primarily about showing off, either, and I think people who consume a lot of these goods have a lot of brand knowledge.
I mean, I think you're right in that watch nerds usually have more ___domain knowledge, but I don't think it's inherently dissimilar.
Just like those collecting stamps, figurines, comic magazines, paintings and so on the watch hobbyist pretty much _never_ makes modifications to their items. Why do you consider it a requirement for it to be a hobby?