As a commercial pilot (not an operator) you are only alowed to charge $ for a select few services... such as, banner towing, crop dusting, sight seeing within 25miles of departing airport and returning to point of departure, aerial photography, sky diving if within 25 miles and returning to point of departure. So here is my question. If you only had a commercial pilots certificate and you wanted to build time doing any of the above, are you allowed to hold out. That is, are you allowed to advertise your services and accept $ from anyone who is willing to pay?