2017 370z

Magicd

Here in Toronto/GTA Automatics are cheaper when used, I think like you said no one wants them. If you want a fun sports car for the summer - get manual.
All joking aside get what you want, but for resale value and enjoyment get manual. (if the wife doesn't know how to drive manual for $200-300 buy her lessons, everybody that drives manual had to learn)
If you haven't driven one with the sport package, do yourself a favour. Its worth the extra money all day long. Man the brakes are amazing on them.
If you are buying used there isn't much price difference with the sport optioned cars.
As why a used 2014/15 is more than a new one left over on the lot - no idea. Maybe they are a celebrity and think their car is worth more than new some how. Or they are hoping a sucker comes by and doesn't do their research like you have. People can ask as much as they want, what they sell the car for is totally different.
I got mine for $3000 less than the guy was asking just a couple weeks ago.

My 2 cents