These are good points. First, the mention of food trucks in Koolauloa using the alternative containers voluntarily. This is for marketing purposes. Their specific subset of consumer values this as a premium service, and therefor they pay more for them.

Second, the price difference in non-styrofoam containers: about 20-30 cents a piece. This is the wholesale price. This means the price added to the end consumer would feasibly be as much as 50 cents a piece. I priced these things out through internet sources, and asking a few shrimp shack operators what they thought about the proposal. (So take this with a grain of buttery garlic salt.) If the state mandates a change, economies of scale might bring down the cost. But I'm not sure if that's applicable in our market. Another concern is that the containers are of sub-par quality for some uses. Of course, things will change as technology progresses and consumer demand changes. 

I personally want to see us get away from styrofoam.