Nutty? No, munge, it doesn't take a nut to do HMs -- anyone can do it. Seriously. It's not that long. Not much different than hiking up to the High Peaks with a pack. On the other hand, what Mr. Salad does, that, is nutty!
Uncle Stinky, right now that I have no desire to do a full one, but I have to admit that more than a year ago, I would have said the same thing about HMs. It's just I've heard too many injuries related to training for marathons. Plus, I can handle one or two short runs a week during lunch breaks at work, but training for marathons requires a lot more than that -- it'll take my time away from climbing and cycling. Hmmm... I don't see it happen. And, I'm with Munge on this -- that marathon stuff is nutty.
