If you're shooting for a friend's event no charge. The client paid for 40 of your friends talents/models plus 4 of their own videographers. No Photographer. You took candids and coverage of the event using top notch equipments (not amateurishly taken). The clients wants your photo, however, you must...
1. Remove all traces of your watermark
2. Not getting paid for your photos at all
Would you have give the client your photos out of goodwill?