I've had the same keyboard for like a decade, but I go through mice every 3-6 months. I've tried logitech / corsair / no-name / razor. 90% of the time I replace a mouse because of phantom double clicks or the mouse3 button just ceasing to work.
More rarely, the mouse will reconnect cycle over and over, or the scroll wheel will break.
I don't THINK I abuse them, but my body count indicates maybe I'm too hard on them and don't know it.
Maybe we need hardware that'll give us data on how mean we are to them so we can gain perspective. :p