It depends..are the proceeds from their investments used as profits or are they used to help people? If the money is reinvested into helping others then they should not have to pay taxes. After all, if you were struggling they would probably help you. On the other hand, if the money is personally pocketed for personal gain then they should pay taxes. Your question should analyze the matter deeper because if the portion of money collected through TV is used towards helping others-then they should not pay tax. However, if the money made on other ventures is used for a personal profit then they should.