Human beings are each wired differently and by sending your children there, you should not be looking for a "fix" for anything. Therapy is designed to do exactly that, promote healthier behavior, but not guarantee anything.
Sounds like an Ed Con.
14-19 months, $6,000/month + $20,000 for wilderness = $135,000.
And don't have any expectations?
Ever wonder why they have to make such a disclaimer?
Keep your kid home and get some intense family therapy, which unlike TBS/wilderness, is evidence-based with a higher success rate.