The real question is why do people who choose not to overclock or can't overclock always question the practices of people who do choose to or can overclock? What's their motive exactly? When I'm using heavily CPU dependent applications, like the Dolphin emulator for instance, in both actual use and its specific benchmark tool I see a significant increase in performance. Why not push the chip that you paid for to its limit so as to maximize its value and slightly "increase" its longevity?
I don't care about how my hardware stacks up to other people's hardware, although it always is good to have a general idea if you had bad luck in the draw, but want to extract every single last dollar that I paid for it out of it in performance. The same can be said about overclocking a GPU, it's all pointless until you're getting a critical 10 fps increase in performance.