Yeah, the standard plugs are iridium, not platinum. Both platinum and iridium plugs last longer than copper plugs, but they cost about 5 times as much, but don't last 5 times as long in my experience.
The copper plugs I mentioned are what plenty of people run, and they work just fine. You will need to change them every 15,000 to 20,000kms though, depending on the conditions of your coils.