You do not need to re-type this entire letter to do your own posting. This will copy the entire letter into the computer's memory. Good luck to everyone that tries. No catch, that was it. You will now become part of the Mail Order business.
Many large corporations are happy to pay big bucks for quality lists.
Next, place one card into each envelope. What you are doing is creating a service. Look at it this way. You do not need to re-type this entire letter to do your own posting. This will copy the entire letter into the computer's memory.