I bought an exercise bicycle and never used it for exercising. It does make a good clothing rack, however.
I buy tools all the time that I never use. My son takes them outside into the yard and leaves them there. Sometimes I think I should join the Screwdriver of the Month Club, just so at least one day a month I will have one that I can use if I need to.
I also buy DVDs, CDs, and a few books that I have never opened, viewed, listened to, or read.