I have done it before. Quite disturbing.I don't know. It's not what I'm so into.The cost per an email is low. And upto now I haven't had any idea yet about point per email or something like that.If you want to do this thing, here are my suggestions:-Create a new email and use it only for this-Try to be organized. After a while you might find yourself lost, since you will have to subscribe to many websites. If I were you, I'd make a list.-Make sure you have time for this. It's a business, at least I think it is.The most important thing is "be organized." I really mean it.Good luck