God wants us to use our resources to help others, but He does not want us to be naïve. Use the business, common and spiritual sense that God has blessed you with to stand up to people with unfair business practices. Study His word to see how He handles the enemy when it tries to disguise itself as a supportive customer of yours. The same family member asking you for a free service is the same person that would never think to negotiate their electric bill. The same church member who wants a discount is the same person who will go to a restaurant and not only pay the full bill, but tip the waitress on top of it! Do you not deserve that same respect and consideration?