Hi Jeff,
I am not in a position to answer your question on the YA as I am from South Africa and things here works a bit different, but I think IA gave you a good answer. However, I would like to ask other questions to you for consideration. You don’t have to reply, it is just to add some perspective on this as well in order to avoid disappointment in future.
I sense that you want to spend your money well and in return that you expect your son to make a good and decent living out of yoga. Few yoga teachers actually makes ends meet at the end of the month through yoga only. Most teachers (In South Africa anyway) still holds a normal day job as well. Most teachers I know do it not for the money but for the love of yoga.
Then, how old is your son? He sounds fairly young if you going to pay for his course. Does he really has the necessary wisdom and experience to be a teacher? Becoming a teacher is a heart decision after much investment in yourself after many years of learning. Remember you’re not just a teacher of yoga to many, but you also become sort of their ear to listen to their problems, which is sometimes highly emotional problems. Is your son ready, emotionally, to handle this type of responsibility?
Another consideration. As a yoga teacher you are responsible not only for the physical well being of your students, but also their spiritual growth and well being. Again, will your son be able to handle the responsibility?
In the end, becoming a yoga teacher is a process of many years, well for most of the teachers I know and for me it was certainly so. This doesn’t mean it has to be like that for your son, he might be a very advanced soul, but this is why you have to ask these questions as well, becasue you know your son well enough to make the correct deductions.