I have medium length, pretty straight hair that I highlight every 8 weeks. I barely dry it and straighten/curl it about once a week. For whatever reason, I just cannot seem to get it to grow long (and be healthy, too). It's super annoying. I have tried deep conditioning treatments, thermal protectors, biotin pills, etc. Does spending $80 on shampoo and conditioner classify me as insane? I've heard wonderful things about this stuff & since I just got my haircut- I'm hoping this will help me start out on a healthy foot. What would you do? Would you spend this much? Or is there another shampoo you swear by?