Did you know that car makers push out a new version, only slightly different, annually? Companies who make golf clubs, also push out new versions at least annually. And companies who make TVs, they also do this.
For most models, the car is essentially identical for about 5 years before the platform is completely re-engineered. Usually it's just minor aesthetics, or features, and bug patches in the interim. And the car is usually fully supported for at least 10 years.
On the golf clubs, as a non-golfer (only golfed 4 times in my life) I find this hilarious. The 2015 models will be outrageously expensive compared to the 2014 models. As if golf club technology actually changed that much in a year, especially for someone non-pro. It's not even like a car where it will deteriorate just sitting there. And usually the golfers will go on about how great the weight of the club is, talk about non-nonsensical technique tips, and basically be not much better than I am with the crappy 20 year old rental clubs at the course.
On TV's, they are so generic I'm surprised they put any effort into minor model revisions.