Doubt it has anything to do with flight sims. I've played them for as long as I can remember. I also fly RC planes and helis, so I'm very used to pulling back to go up.
For games however, unless it's a flight sim, then down is down and up is up for me(No invert)
For games however, unless it's a flight sim, then down is down and up is up for me(No invert)