Purchase of real estate photography licensing entitles the buyer to use of the provided photos only for the specific purpose of marketing the photographed property for 1 listing period. Further use of the photographs requires additional licensing agreement between the purchaser and the photographer.
US copyright law expresses that the creator of a work is entitled to compensation whenever their work is used. If a photographer's work gets reused in a commercial pursuit, the photographer should be due additional compensation for contributing to that further pursuit. Please don't steal from America's entrepreneurs who are working to support their families! Thanks!