I too fold Ace-rag offsuit almost every time. That hand offers terrible reverse implied odds
The times they're useful to me is when I'm short stacked in a tournament (not only when I'm short compared to the rest of the table, but also when my stack is small compared to the size of the blinds), which occurs mostly during the late and middle/bubble stages of a tournament. At that point I mostly treat them as a shoving & blinds stealing tool (or a calling tool if I'm BB and someone who's been shoving wide shoves on me from late position, it's folded to me, I have the odds to call, and losing the AI wouldn't completely destroy my stack).
Oh, nearly slipped my mind--of course, HU any kind of Ax exponentially increases in value.