I agree the price of some sound therapies seem high. I did the Neuromonics program: it was $5,000 USD and ran for a year. But I would argue that worth is subjective: if the program helps you (and you have the money), it could be worth it to you. Others here at TT have done experimental treatments that have cost far more in clinical expense and travel. It would not be worth it to me -- plus its not in my budget anyway. But it was to them.
I actually advise people who are tech savvy -- and I am not one of them, which is why I went with Neuromonics -- to try DIY sound therapy first, as it may give you enough relief and save you some bucks. However, as wonderful as people on this forum are, they are not a substitute for properly trained medical professionals giving you individual attention. I am not sorry I spent the money because, in part, it gave me access to a fine audiologist and university-based physicians who helped me greatly.