Why ask why?
Not all pedometer's have annoying clicks.
most work off the pendulum motion of a person's natural gait. You need to place them on a spot in your belt that corresponds with the middle of one's leg. That's just how they work and it's really not too hard to set up.
Omron Digital Premium Pedometer is $36 and is consumer approved.
I think mine is about a $20 Sportline