Oh ffs, I'll try again. ...
I had a look at that MyTutorWeb site you linked to on the other thread. Are you aware that they charge their tutors £6 per hour (from the £16 you pay) for using their virtual classroom? That seems to be an awfully rough deal for the student doing the actual teaching tbh. By the time you take away additional costs for the student doing the teaching, such as graphics pad, headphones etc which they say the tutors must have, plus time for planning the session, feedback, marking etc, I'd be surprised if the tutors are even making minimum wage.
Other sites and agencies don't take such a large cut from what is already a very small fee in the first place.