The cost of insulin has very little to do with how much it cost to make.
It has everything to do with the system in the US.
Insulin is cheap in Canada, the same insulin in the US that cost $300 cost $30 in Canada. So being that Zimmerman is not going to manufacture and sell a product he will have little success.
All o the big players can make if for cheaper and sell it for cheaper now if they wanted to, they have very little incentive to do so.