How long should a cartridge last?


I have a Shelter 501 that started acting up (skipping...I also didn't set my new arm up properly). The folks at The Analog Room said I needed a new cartridge, which I just got. So, my first Shelter lasted about 3 and a half years and saw very regular use, perhaps an hour a day, maybe more (on average). Still, I was surprised it went kaput so fast. Do folks typically just buy a new cartridge (as my dealer recommended) or just get a new stylus? I did not quite understand the explanation...the "suspension when out"...I could call my dealer and ask again, but I thought I would post here and see what other folks might say.
mcmprov
You should have gotten a trade in for your old shelter 501. The replacement price is $650-$700, somewhere in between. This is from Axiss audio, the importer. Not setting up the Cartridge properly will shorten the life. My last Shelter 501 had about 2000hrs when I replaced it. The Analog Room should be able to help you set up the cart./arm properly.
Send the old one to Soundsmith and get a new cantilever installed. Cost starts at $150. They have done a couple for me.