I have updated the " Site Guidelines " on point 3. I have added the " no refunds " policy due to the first case I had today. I will explain here more in detail.
Every student can find out for free if the system works for them or not. With the premium membership you get the backing tracks, tabs and blog feature and support that the video's are free for everybody. If somebody purchases a premium membership they can download all in one day and then ask for a refund. I don't think that is fair - so am not willing to give a refund. The other point is, that it creates additional administrativ work.
But in this case I gave it since the rule did not exists till now.