I figured that they could have looked at your neck and your back at the same time while you're in that body tube lol, but what do I know since I've never had any tests. ;)
Yes, it would be much better for you to spend that $320 on something that will help you heal rather than spend it for something that is going to be really dangerous for you! I looked today and the Teeter is $299 with free shipping so you'll have some money left over!