3 Reason to have FAQ page on the product now a days:

• Helps prevent refunds customer service inquiries:
  Having the ability to answer potential buyer’s questions before they shell out their money can save you headaches down the road. If a customer gets his/her questions answered before even paying for the product or service, it will show that your understanding of their needs is that much better. Prevent refunds and charge backs by handling objections before the sale using FAQ’s!
• Allows the customer to trust you:
  Trust between customers and the companies they buy from is an issue at times. Again, if the customer is spending their hard earned money on YOUR product, you better be sure that you repay them with excellent customer service. A FAQ that answers their questions is a giant step towards that goal.
• Shows that you re passionate about your product:
  There are business owners out there that are sitting on millions of dollars and have reached a level of boredom that sparked them to start a new company that isn’t their top priority. You need to prove to the customers that you aren’t one of those companies. Having a FAQ’s shows that you care enough to interact with potential buyers to make sure that they get all the information needed to make an educated decision on your product.

The ultimate goal of a company is to put out a good product with happy customers. Having excellent customer service, starting with an FAQ’s section will help bridge the gap between customers and your product.