In my opinion Envelope stuffing is not a good business. I am talking about the ads you see all over the place that says you can make thousands and thousands of dollars a week by mailing an envelope. Usually they want you to pay around thirty dollars and than they send you a throw together kit. It is not worth the price because all they instruct you to do is basically put some fliers out and instruct people to send you a dollar or two. I don't think it works because why would someone just send you money and half the time there is no phone number for you to call if you need support. All the communication is done by email usually and getting a refund seemed to be hard.
Also I am pretty sure that mailing postcards for money use the same concept and I do not see how this is legal and how people still get scammed by these kinds of companies. A good tip to follow because I believe that some of these companies are legit, if a company is legit and can guarantee you success than make sure they have a phone number that you can call and actually talk to someone because that is a good way to tell if a business is not trying to hide behind an email address.