Personally I can not imagine anyone who make great calls selling them for subscription fees. There are only so much liquidity and once the number of subcribers reach a certain point those calls will be less and less reliable. A professional trader doing this as a hobby to share with others for free gets a lot of credit from me. Someone who makes a lot of calls but doesn't trade will never ever receive an ounce of respect from me. If you are the man, be there on the front line.
My advice is learn the game of fishing yourself, and do not rely on others to bring you fish. I mean, if it was so easy, that all you have to do is subscribe to a few rooms and make size even if you don't know much, everyone and their mother would be doing it.