First - why not? Better ground clearance without a lift, solid front axle, stronger gear sets. Depending on where you're living, these are things you definitely need to consider that don't have anything to do with towing.
Second, as he said I think in his first post, it's cheaper to insure for him.
There's plenty of other reasons to own a big truck that don't have anything to do with towing. I had a PowerWagon for 5 years, and now I've got a CTD. Before the Wagon I had 2 different F350s, an F250, an older Ram 2500, and a GMC 2500. I've never owned a half ton truck, and I don't regularly pull anything at all. I do OWN trailers that weigh over 5k lbs, and depending on the year I might pull them once to 10 times a year.