Depends when you ride. I used to go through a rim in 2yrs commuting in the winter. The rain and muck formed a grinding paste that would wear the rims down.
I haven’t worn out a rim on a summer bike so if you don't spend much time in the wet I wouldn't worry about it.
Cost to replace the rim is roughly 50 to 150 plus labor.
Last edited by gregf83; 08-13-19 at 07:48 PM.