There is a difference between buying a book or computer program for under $50 and charging many hundreds of dollars per student for teaching a class if the teacher isn't transparent about conflicts of interest to his or her paying clientèle. Offering knowledge in print or electronic media is one thing. Charging tuition for a school that is contra to the lessons being taught due to security consulting positions is quite another thing. ...and by your own admissions, teaching isn't the only option available to experts who have been banned from playing in the casinos.