You are not the exception to the rule. You will not cure them of cheating, because you're an awesome person. A cheater will always be a cheater. Especially, when they are cheating long into adult years.
Put these Stickers on the outside of every plan catalog: "If you like what you see and your wallet says no. gather 6 orders and call it a show!" Use them for incentives or awards and front and back of every catalog you hand out.