I did contact them. You have to contact them via Facebook. Here is their Facebook link.
Here is what they sent me:
Daniel, it depends on your specialization. Unfortunately, we can not afford high wages as we work with Russian clients and go through severe crisis, therefore we try to simplify the work for our tutors by preparing the program materials which makes it easier for our teachers and saves a lot time for them. In general, we offer around 7-9 USD for 50 minutes class.