The other day I bought Ashton Guilty Pleasure for the first time. Last week's purchase of Three Nuns, Wallace Flake, Brown Twist Sliced, and Black Irish X were all new to me. The week before was my first purchase of Pete Balkan Delight. Etc. etc. etc...
I mostly buy new stuff since there are so many things I haven't tried. Since I returned to pipe smoking last year, I think the only things I bought more than once were MM965, The Aperitif, University Flake, Nightcap, and Bayou Night.