It's a $400-500 add on for me and the application process takes me around 3 hours to complete. I also make sure to qualify my client and thoroughly discuss the pros and cons so there are no surprise expectations.
Disclosure: this product is different than any other on the market. Dealer paint protection sealants pale in comparison to this technology. This isn't a product that should be undersold as it will ultimately be counterproductive to it's potential growth. Especially in the dealer retail market. If you're offering a product that can last multiple times more than what a traditional sealant does, why not upcharge accordingly?