We are going off topic, but yes, UM fees are high and it’s totally ludicrous that a 14 or 15 year old can’t fly alone without having to pay UM fees. It’s all about airlines covering their bottoms.
As for the original question, and for other parents who might be wondering about similar summer programs, $2400 for an online course seems very high to me. Five years ago, our then-high school daughter did a three week residential course at Carleton College for credit and the whole cost was about $3000+. I feel $1000 is much more reasonable for three weeks of online learning.