Interesting thread,
A couple of other additional factors I consider are
Yearly production volume, and by extension
Number of Outlets/SC's
As nice as it would be to own a limited production piece (read low/exclusive brand volume), unless you hail from La Chaux-de-Fonds, or indeed have a grandfather that's a master watchmaker (which would invariably invalidate any warranty!), come service interval, or, dare I say, mechanical failure, I envisage a sizable headache in the making.
A large, yearly production rate, while not screaming of exclusivity, usually equates to easy access to the, hopefully efficient, service/repair network of the brand. And besides a lot of them still produce exclusive pieces should you desire something other than the 'norm'