Agreed with everyone these products are profit generators and are not needed. Ask the salesman why a 2011 Subaru is manufactured with inferior paint, carpet, fabric, and leather and listen to him stumble through the answer.
Back when I worked for Nissan, on several occasions on a late Friday afternoon sometimes the sales dept. had some cars to be delivered to customers on Saturday and the detail guy was swamped. They paid us mechanics to "install" paint protectant and this job was a voluntary deal. We did not even have to do it at all but it was a snap to do; a.k.a. easy money with no brain power involved.
This paint protectant was nothing more than a very thin wax that was easily rubbed on and wiped off. I could do an entire car by myself in 20 minutes tops.
What was unsaid was that after one trip through a high pressure car wash the paint protectant, assuming that it had not been washed off by rain already, was going down the drain at the car wash.