Why aren't threadfin shad a common item?

What makes threadfin shad different than any other forage species being stocked? The spawn twice a year right? They are also readily available at the hatcheries for "expensive" transport. Are they harder to keep in holding tanks for customer pick up? I know from experience that they are no harder to transport in spring than BG or CC.

Are threadfins a marketing ploy, only intended for the guys with the big pocketbooks? If not, where can I buy a few pounds in oxygen bags for transport?

What is the mystery with this fish?????