I read somewhere that besides the vast majority most golfers averageing 100+ shots a round, most golfers average between 180-200 yards off the tee (and most think they average 240-250). I have only played with one guy who could legitimately drive the ball over 240 consistantly. He is about 5'10" and pretty skinny. So I think its right to say technique has a huge impact, flexibiliy is also probably more important than power, they guy I played with could rotate waaaaay back and still come through with a nice controlled swing.
I am driving my very best right now- and I max out at about 210-220. I play with some guys who say they can drive it 250, 270, and more. They out drive me for sure (when they are straight) but I have yet to see any of them come close to hitting over 250. Watching them, I can see they don't have the kind of rotation that the other guy has- and they clearly don't have the same kind of control. When they do bomb one its usually a massive slice- good on a dogleg, but mostly just a dog.
Funny thing is, they will say "wow you hit that at least 240!" when I hit a drive. But I am sure its never more than 220.
Flexibiliy and technique are the keys I think.
Perhaps once-a-year golfers...but I can't see a somewhat avid golfer who is not handicapped driving on average that short.
Well, actually...200 I could probably see. 180 though?!
Lately I've been able to get it out there 260-280, with ONE drive (and the first of my life) going over 300 last time out. But I LOOK like I'm swinging my heart out, and I am...whereas natural long ball hitters do it with ease and it looks effortless.