Playing in a cheap $6 tournament with 1017 runners, there were a bunch of limpers to me in the small blind at the 10/20 level. I had ♣9 ♣7. For 10 bucks more, I might get somebody's stack -- why not?
I flopped the joint and bozo with A-A went broke. If you limp with aces, you don't get any sympathy from me (in most cases).