The fish you catch from shore are not all that edible. By the time they're in the rivers and streams they're "necrotic"... that's "dead and rotten" in lay terms.
If you're truly just after the experience of snagging a fish, by all means fish from shore. If you want the real Alaskan experience (us locals fish for food, not sport) get on a boat owned and operated by a local.
It's kinda like saying, "I can see whales from my cruise ship... why would I pay for a whale watching excursion?"
If you knew where the fish at Sam's came from and what the Commercial Fishermen are doing (politically) up here, you probably wouldn't buy any of that stuff! ;-)
Happy Alaska Travels!
Better not for now... signatures get me banned!