What else? Another important element is support. A lovely method offers solid support, & keeps you up to date with the latest news & development. For example, a money making associates program that ceases to exist & did not update its affiliate is deemed as 'worst' & not 'best'.
To be honest, there's more things which you need to think about when you look for the best money making systems but I truly think what I have shared is the maximum requirement to have. You can add to the list as you go along but start with the basics.