Liveninja is described as 'Live video courses or consulting from experts'. There are five alternatives to Liveninja, not only websites but also apps for a variety of platforms, including Skype, Self-Hosted solutions, Wordpress and Mac. The best alternative is Creativelive, which is free. Other great sites and apps similar to Liveninja are Minutizer (Paid), Helpouts (Paid), searchntalk (Free) and Officehours (Free).
Pay Per Minute for Skype Payment system for live interactions Are you a teacher, lawyer, coach, nutrition specialist, spiritual trainer, couple and relationship counselor, shrink etc.? Make your Skype ID public (or not) and sell your Skype sessions.