Well that's the thing I disagree that I confirmed anything regarding bragging about overclocking since in my case my overclock of 4.2ghz is hardly anything to brag about not to say people don't do it - my point is that I'm personally not bragging about it. On the other hand what I will agree with you on is bragging about being able to beat up on people with a sleeper, you as a person that loves car's can appreciate the fact of a person that takes a vehicle that someone would usually not think of having potential for less than $5k lets say puts couple grand into it and has a car that can beat up on that $50-60k Corvette is impressive in its own right and this is where the bragging rights I believe can be justified. It's also like saying that anyone that tinkers with there car just does it for bragging rights.
This is a forum with a collection of different people and opinions you are right about that, but most people don't come here for opinions unless they specifically ask for one they come here for answers. So when the OP asked if overclocking is safe instead of giving him a clear answer you provided him with your opinion with saying that basically all people that overclock do it for bragging rights when in fact it actually can benefit you depending on what hardware you are currently using.
Here's a good example of how overclocking could benefit a person using a FX-4000 since they were not able to afford the best CPU money can buy for there application. They wanted to play Guild Wars 2 but complained about poor performance where a overclock helped alleviate some of the poor performance and maybe it was a good enough performance increase for them to not have to upgrade or made that system last them another year.
http://www.tomshardware.com/reviews/guild-wars-2-performance-benchmark,3268-7.html
So that's the problem I have with that, less fact more opinions than anything which I see allot of on here that may potentially steer people away from buying something that would benefit them.