Question about Nissan maintenance schedule

Hello, I was looking through the maintenance schedule for my car with 51000 miles and i saw to perform fuel induction service every 30,000 but service is only offered at the dealership but doesn't mention it on the factory maintenance schedule and also to perform throttle body service I was wondering if i getting ripped off with these service if I use only Shell fuel. I also was wondering do I need fuel additives to clean fuel injectors or other cleaning products if I only use Shell fuel thanks.

using only shell fuel, odds are you are throwing money away with that cleaning, yes