I have an add-in that is designed to protect the PLR product you provide your members in your membership site, in such a way that your members will have to come back to you each month for more.
If you are interested in being a beta-tester for the "Download Funnel," just send me a PM through the forum and I'll set you up with an account, and reserve a cfree copy for you if you decide you like it.
Right now it works with aMember, DLGuard, JVManager and Fantasos. If you use a different membership script, we may be able to make it work for you also.
Kirk