↑agreed. I'd want to know that the teacher has the qualifications and experience relevant to what I'm trying to achieve. Who have they taught, in what settings, do they have good references, can you get a trial lesson if you're not sure if their style will work for you, etc.
Also the choices given are far too broad. "Traditional classes" covers a quite broad range of things from relatively intensive courses to one-evening-a-week stuff. one-to-one tutoring, similar, depends hugely on the teacher/tutor. what is a "traditional teacher" here, anyway? Is this just setting up some false dichotomy? "goal setting" is something only "coaches" do now? Smells like a bunch of marketing bollocks to me.
Personally, I've had very good experiences previously with small tutoring groups (one teacher, four to six of us of a similar level of language skills and enthusiasm).
If Wonko's quote is for a one-hour lesson, then I guess that's supply-demand, but I'd expect at least double that in the UK for a individual lesson (face to face not over Skype) from a properly qualified and experienced teacher, and would personally be willing to pay £30 or so an hour.