Having spent more than a day or two in the commercial fishing industry,,, that hi-lited part should be cast in stone.
Fishermen (comm.) don't fish specifically for bait (except lobster sometimes).
Bait prices are 1/3 what food market $ generally are,,, if they're that high.
Butter-fish, squid, clams, bunker, macks, etc. are not handled the same way if they've passed off as bait on the market. Could be old, rotted / smelly, contaminated (oil, fuel, chemicals, etc.) or just of questionable quality. Believe me, the packers will take a chance on passing off questionable quality in the view of profit. There's no gov't food inspectors watching the process like there is with chickens, pigs, etc.
For this reason I generally dig / catch / procure my own from reputable(er) sources. Stop & Shop for squid,,, Seafood market for clams, etc. This is all in the interest of obtaining "fresh" bait. Simply meaning something not too rotted, spoiled and froze, or as in clams, still alive. For $5.00 you can get a lot of steamers in a fish market that's guaranteed fresh. Fresh bait not generally found in a Bait Shop is also freshly available. Like smelt, shrimp, and such.
Something to consider when thinking of eating your bait for lunch.