I can explain the $1/pound steelhead. To a sport fisherman the demand (need) for a steelhead is worth quite a bit. That is why not many people sport fish solely for food. They enjoy the experience, and that experience has a worth that is apparently greater than the financial costs (I think it is anyway).
The consumer who buys commercially harvested steelhead (or salmon for that matter) is looking for a tasty hunk of food. I suspect the general consumer (non-dedicated angler) views this food source as roughly equivalent to other options (Steaks, other seafood...depends on the consumer). So, if it (commercially caught fish) becomes overly expensive, the consumer will simply substitute something else (like a big steak).
As I think about it, it kind makes me question the validity of the argument about fish being more valuable if sport caught then if commercially harvested. I am sure on a per/ fish basis sport caught generates way more economic activity. But the difference is volume. Commercially caught salmonids must number in the millions in the pacific each year and maybe hundreds of thousands of fish harvested by Washington based commercials. I suspect that the tens of thousands of sport caught fish (even if priced at several hundred dollars each -- most of that being indirect revenue) carres less impact to a penny pincher (i.e. department of fish production) than the money generated by commercial harvest and retail sale.
Oh well, I am gonna go pay a pile of money for a chance at a steelhead tomorrow

L8R