To answer your stupid question, Jim ... and I'm not calling you stupid, only your question ... I'm well aware that insurance companies profits are made from insurance holders (as well as, hopefully, a shrewd investment portfolio).
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I'll tell you how they do it.. They do it by excluding people that will cause them to pay big medical costs, and by denying benefits all along the claims ladder. I've dealt with it for 30 years, and I know how they work. It is no secret, and I am amazed that anybody could take up their side as if it were a good thing.
If you think about it, why would they do anything else if their goal was profit?
Jim..