I take your point, but I think you're drastically overestimating the quality of the sushi place. If you grab whatever cheap salmon is frozen then you'll likely be eating the same salmon that's used at a restaurant. (Even if you're on a coast, your salmon will be frozen for at least 24 hours before being served raw to kill those nasty parasites.)
Your local grocer's counter is a disappointment since they've basically taken all of the lovely seafood that was individually quick-frozen at the source and thawed it out for god knows how long. That shrimp sitting behind plexiglass stinking the place up? It came to them in a bag frozen just like the bag sitting in the freezer case just to the left. It will be cheaper and higher quality if you buy the bag of individually quick-frozen (IQF) shrimp.
If you live on a coast and go to a local fish monger then you can get better results. But even your fancy grocers are thawing pre-frozen shrimp unnecessarily.
Your local grocer's counter is a disappointment since they've basically taken all of the lovely seafood that was individually quick-frozen at the source and thawed it out for god knows how long. That shrimp sitting behind plexiglass stinking the place up? It came to them in a bag frozen just like the bag sitting in the freezer case just to the left. It will be cheaper and higher quality if you buy the bag of individually quick-frozen (IQF) shrimp.
If you live on a coast and go to a local fish monger then you can get better results. But even your fancy grocers are thawing pre-frozen shrimp unnecessarily.