I have so many pens and pencils, I couldn't use them all in my lifetime I think. They're all so pretty though! So I call that collecting, not hoarding.
Aside from that, I have a ton of mice (the computer kind) that I just can't throw away but don't use because of various defects they have. One's wheel doesn't click unless I press really hard, the other has a defective left button that lets go in the middle of highlighting, and another one whose cord has to be jiggled for the optical sensor to turn on. I finally gave in and bought an expensive logitech one so that it wouldn't start acting weird after a week of use. After about a year of use, the wheel started registering each click as if I clicked three times. So when I wheel click a link to open a new tab, 3 tabs open.... :(