+1
I just like to keep track -
I've averaged 5000+ per year, nice to see those big 4-digit numbers on the odo.
It's also fun to keep track of the average speed over a week or so and see if i can get it to slowly creep up as i get fitter.
It's not a big part of riding for me, my mtb doesn't have one, but it's a fun cheap accessory on the daily ride