I usually have 2 pairs of DC's, a pair for work and a pair for everything else, and I usually only get a year out of a pair so I guess if I only wore one pair I'd only get 6 months out of them too. But I'm also slightly large.
I stopped buying DCs for the same reason. I've had suede Etnies Calicuts last me years. I don't have very good luck with shoes made of synthetic material of any brand. I'm not sure what DC makes as far as real leather goes, haven't looked In years.