This is a topic that has been done to death. Why rehash it again?
Also how much do you pay for your certifications? If you pay KKW prices then you know as well as I that there is not much money to be made there. One 1st Dan certification is roughly $50.00. This gives you the cert, a card and a listing in the database. This also provides for the mailing to get it back. So again, let's low ball the estimate in putting this together. You have the paper and the id card probably costs them $10.00 at most. Then you have to higher someone to do data entry so lets say $.50 of fee goes to that (since you are looking at lot of these to be processed). Finally to ship it back is around $10.00. So now your "profit" is $50-20.50= 29.50. So TKD will make a total profit of $29.50 per 1st dan. Naturally I did not include other expenses such as utilities, other personnel, etc.