I'm an undergrad at USC taking several pre-dent minor courses at the USC dent school. I hear ppl saying the same thing a lot, i.e. it's nonsense to pay so much for self-taught courses... but what I saw at the dental school is kinda different. Last year I had this old dentist as my dental histology professor who was also leading PBL sessions for dent students. When he lectured, it's just reading off the slides, but I happened to see their PBL session and it was a lot more dynamic. At least for the 10 min I was there, the professor had comments for probably each student who spoke up (they've done the research at home and were discussing some diabetic case). it was clearly a lot more mind consuming for the professor than to simply reading the slides.....
Back to what you said, yes I am concerned about it too!!! USC is becoming the most expensive dent school this year, why do they need this much money?? However based on what I saw, the professors might just well deserve higher salary cuz they wneed to guide and engage in the group learning. but again, I only saw 10min of the 2year pbl curriculum... do you have more info? is PBL actually a sheer self-teaching scam??