I'm in the finance department, and while I can't speak for all products, the one we use is definitely worth the money. It isn't the product you are paying for, it's the professional application, the warranty that comes with it, and the added resale value when you trade or sell the car later. We charge $1000 for exterior 10 year protection and interior 5 year protection, and an additional $600 for 5 year rip, tear, burn, windshield replacement, dent removal, and alloy wheel protection.
If you keep a car 5-10 years, this is a great way to keep the car looking great. You end up keeping the car longer which saves you sales tax. Plus, you don't have to wax the car anymore, and you don't have to wash as often. We literally just hose the cars down. This also reduces my personal pet peeve, which are swirl marks
Any contamanents that get into paint that has not been treated can only be removed with an acid was or a buffer, which are both dangerous to the cars paint if used too often or even improperly just once.
Also, something to keep in mind, I've been in this business 10 years, and my father has been in it over 35 years. Salespeople, who are human, never get the benifit of the doubt when they say something inaccurate. It happens, but I see misunderstandings and communication breakdowns every other day, and have only see a few times ever that someone straight out lied.
Think about it, sales success is about repeat clients and referrals, which you lose when you lie. Liars are pushed out because nobody wants to work or do business with them. 95-98% of the time a salesman says something inaccurate, they didn't intentionally lie, they just didn't fully understand their product.