I recently had to fight with the fact that my best friend is joining Quixtar as an IBO

He and I differ in opinion on this and I can’t make him see that he may be getting himself into something that could end up hurting him financially as well as personally(family). Does anyone have personal experiences that I could relay to him that might help?
He is a very persistent person and it would take hardcore evidence for him to give this up. I just don’t want to see him get hurt as I have a ton of respect for him! Thanks for anything you can provide.