It's a great watch. A good buddy of mine has been wearing one daily for a few years, now, and he loves it. The Bond GMT had applied markers and co-ax before the standard Bond, and it was reflected in the price. I think that's one reason we don't see more.
Back in 2006, the previous-generation standard Bond (ref.2531.80) was priced at $2150, whereas the GMT was $3400. $1250 is a pretty substantial difference. Now that the current-gen standard Bond (ref.2220.80) has been co-axed and given the aesthetic upgrades, the price difference has shrunk to $370, at $3650 for the GMT and $3280 for the standard Bond. Maybe, more GMTs will start showing up.
eric