Question about percentage charged for FVFs

I was just reading many of the posts on a previous thread "No Sales" which developed into many comments from posters who have joined and had varying amounts of experience with QS.

 

I got inspired and joined up myself.

 

Then I tried to find something in all the online info about what percentage commission is charged on each sale. Couldn't find it anywhere.

Can anyone help with that please? 

Thanks.