I'm sorry I think my comment was taken a little more broad than it was meant to be, yes many people compete with normal self defense guns and can be quite successful. But there are also people in martial arts that study in a self defense based system that go to tournaments and are also very successful. It's not because the system is necessarily so great, its because the trainer teaches fundamentals and how to build upon that. A good instructor and lots of practice makes the shooter and the martial artist better in self defense and in competition.
No argument with the point in italics. However, the original contention was that competition shooting was just like competition martial arts, and my point was that there was a significant difference---specifically, that competitions in martial arts do not test all fundamentals (the specific example I gave was power) and that competition shooting DOES test all fundamental shooting skills.
That isn't a function of the instructor. And while students who learn martial arts from good instructors can also do well in point-sparring tournaments, that isn't a function of the tournament--that is a function of how the individual practices. (After all, a person can do very well in a point-sparring tournament without good fundamentals, too.)
In a similar fashion, for shooting, how the person practices will be the determining factor. Except the main difference is that in competition shooting, you still have to have good fundamentals to do well. If you don't have good fundamentals, your scores will show that directly.
I also note that "yes many people compete with normal self defense guns and can be quite successful" while true, it is a little misleading. It makes it seem as if people compete with normal guns against raceguns, and they can still do all right---and what is actually true is that there is an entire division devoted specifically to full-size duty pistols who compete solely against each other.
In other words---people who dismiss competitions because people are supposedly using raceguns are dismissing the second-largest division in USPSA. And in Nebraska. (Some days, Limited has more people, some days, Production has more people. Limited has the edge slightly, but not always.)
In terms of people who are classified (meaning they shoot fairly regularly in that division, on average), here is what it looks like both on a National and on a local level:
(http://farm9.staticflickr.com/8543/8696371672_98b6349949_z.jpg)
The extreme racegun division (Open) is quite a bit smaller than the Production division. (Single Stack isn't included because USPSA doesn't have records by state for that division, for some weird reason. Nationally, Single Stack is at 12%, and locally is it probably similar--between revolver and L-10.)
So---in many martial arts competitions, not all technique fundamentals are tested. In a shooting competition, all shooting fundamentals ARE tested--and for many people, they are tested using perfectly normal duty/carry weapons.