Wyzant takes up to 40%:
http://www.wyzant.com/howitworks/popup?popupId=ServiceFees
That said, this is still much better than the corporations who charge $150/hr and pay their tutors $30-40/hr. Also, I am sure most Wyzant tutors (just like tutors from other organizations) tutor the company's clients on the side, which although somewhat unethical, is also totally understandable considering the 80% cut the company takes.
Just some other counter-points to the points above (not trying to argue, as you are not either, lol - totally agree that if two options were in-person-vs-online
for the same price, then in-person would be better):
(1) Would have to agree to disagree on this one. I totally agree that body language is extremely important for tutoring, but at the same time, I find that conveying this through Skype (tone of voice, facial expression) has been just as effective for me as a tutor.
(2) Would have to agree to disagree on this point also. Most of the time, the material I review with my students is digital (i.e. AAMC practice tests online). Thus, we can usually share their screen via Skype and I can walk them through the problem easily.
(4) Again, agree to disagree (but it is very user-dependent). Experienced online tutors are accustomed to using pen+tablets that it becomes second nature. Online drawing, in my case, is actually more effective - not necessarily the initial draft, but rather, erasing and re-drawing is easier digitally than with pencil. That said, most of my students do not have the pen+tablet, so are unable to draw themselves, but I cannot remember the last time that a tutee drew something in-person either, so I guess it is not a huge issue.
(5) Have not found this to be a major issue.
(6) Agree that this can be a hassle, but does not happen often in my case, as most of the students I tutor use the same high-yield materials that I have access to.
(7) Would have to agree to disagree on this one also. This is likely dependent on whether the tutor and/or tutee would prefer paper-vs-computer learning. These days, I have found that I and my students are more accustomed to digital learning, as everything seems to be moving in this direction. That said, there are some students and some tutors who prefer paper.
(8) I would have to say that in the last 100+hrs I have tutored, I have not had one session that was significantly delayed because of computer glitches or dropped connection. Maybe once or twice Skype was dropped for 30seconds. I guess FIOS has been good to me and my tutees, lol. Like you said, however, this is completely dependent on what service provider the tutor and tutee have, so it may be an issue for some students.
(9) Have never done office hours with a tutor:tutee ratio of 1:3, so would not be able to speak to this.
I too was skeptical about starting to tutor online, but many hours of practice, it is now seamless.