When folks signup they get an e-mail for the next step. Instead of providing a link in order to complete the signup maybe instructions should be given such as go to dual-boxing.com, click on this link then on that link, then enter this code. Before providing instructions, give a generic well written paragraph about multi-boxing - something along the lines:

"Multi-boxing is not for everyone, it takes time to setup your environment, it will cost money, and it will require you to do some reading on your own so you understand how it works and how to set things up. If you don't want to bother with the technicalities, then no one else is going to do it for you. Yes it does help if your are computer literate or at least if you are willing to learn the basics on your own."

There will still be peeps who won't bother to read or pay attention to that, but at least it is a warning of things to come