How long do you folks expect clipless pedals to last? The reason I ask is that I had a pair of Ritchies that I had used on a number of bikes over a ten year period, they were worn but I kept them clean and oiled. One day sometime back, riding along the canal trail here in DC I stopped and the pedal refused to let go. Well - the result is pretty obvious. The bad new was I was falling toward the canal, the good news was there was enough grass and bank to stop me from getting a dunking - and the bike - ow... The good news was that the grassy bank softened the fall - the bad news was there was the stub of a small tree that had recently been cut that pierced my shorts and thigh and about 1/4 inch into my leg.
I fiddled with the pedals and decided that they were simply too worn so I got some SPDs. This was three years back and about 2,500 miles ago. They still work fine but have clear signs of wear - and I would that they did not suddenly refuse to let go for a second time. I liked those Ritchies, they were very precise and crisp.