[Dewie]

Insects might be more economical, or at least eventually when their production is more mainstream. But food is relatively cheap today anyway; what is expensive is rent/or mortgage. Food for a single, working person doesn't really make such a dent in the budget that they are forced to thin "damn, there has to be some alternative to this", compared to what they spend on their rent. So I don't think it's that much incentive to eat insects, from an economical perspective.

[technomancy]

If this were the case, why does Coke contain cheap corn syrup instead of good-tasting cane sugar?

Even if there's not enough of a difference for an individual to choose one over the other it doesn't mean companies with huge economies of scale won't choose differently.