Human are curious animals. But we forget things too. I have probably clicked through all the buttons. But if the name doesn't make sense to me, and I have only used it maybe once (out of boredom or random habit), I probably won't remember it. Hence I probably won't recall using that button. And when I click on my profile and see "submission,comments" I make a habit of going there to find my comments and submissions. Because that route is semantically correct. Under your profile, that got to be my stuff.