As a business owner in a customer service type business, it would be very poor business to charge your customer for a no issue found. When we install Directv or Dish Network at a customers house, we will give them the first call if it is a customer screw up, if it's an equipment or installation issue, then that doesn't count as the customers first free service call. This has been a practice in my business for over 25yrs and word of mouth is my best advertising. Shame on any business that doesn't provide quality customer service. With that said, it is amazing how huge some huge retailers have gotten with poor customer care!!