I would say
That Patek exept from the collectors and watchs nerds like us was totally unknown to "population" probably 3 or 5 years ago (unlike Rolex).
Who would be mad enough to put 10s of K€ in a watch
Now with easy money and instagram every one wants to show off with an expensive watch, expensive bags shoes etc etc ... and sports watches are easier to accomodate than complicated ones. ( i m still wondering how the full diamond fashion is still alive though).
One additional thing to note also is that at some point Nautilus and Aquanaut are entry level Pateks... so they were "easier" to get and show off.
Living in Paris you can see LV bags everywhere, now how many of them are legitimate ones ?:p ....