The secret is to hold the lens not the camera. That "grip" on the camera isn't to support it by, it's to steer it by. Try hanging onto the camera by your right hand for any length of time and you'll get a very fatigued arm, and shaky pictures. But rest the lens on your left hand and you'll be able to go all day with no problem.
I agree completely and guess I should have further explained. I have pretty severe arthritis in my right hand. With the standard grip, my pinky curls under the body and tightens my hand up so I end up with pain. This is from shooting, not supporting the camera.
And that is a perfectly logical reason to get a grip. I was just pointing out that more often than not, many folks just get it to make their small less expensive cameras look more "pro like" for a lack of a better word. I should be more careful making generalizations it seems. I am sure many folks find some practical benefit to using a gripped body. To date, it has just eluded me personally.
I think we just have different viewpoints. I do agree that there are a lot of people out there that buy a grip for looks but I also firmly believe that they can make a substantial improvement. I think your statement just got me on a bad day and, as someone who has been positively impacted by a grip, I took offense. I think the truth probably lies somewhere between us.