Except we've been to expensive sushi places too and didn't see the benefit of having to pay $90 for a casual dinner for two. What's so special about bluefin's food?
The value proposition is one thing and very agreed - can't eat expensive sushi meals all the time and sometimes 3 rolls for $10 is what's on deck.
However it is ridiculous to make an objective comparison between buffet sushi and sushi-ya sushi.
1) Not all rice is created equal. The sushi buffet's 3rd rate 12 month old rice cannot compare to Mori's custom rice blend which is only sold to Mori direct from the grower
2) Not all rice vinegar is created equal. There are multiple quality levels in rice vinegar. You can safely assume that most lower quality sushi uses bottom of the barrel rice vinegar
3) Most people do not place enough emphasis on the rice. Rice should be served at the correct temperature (depends on the style of sushi) and well seasoned. It is not optimal if rice sticks to your fingers/the plate. The crappier the sushi joint, the more rice will stick to your fingers/the plate.
4) Nori comes in many grades. The stuff you can find at the supermarket is on the 2nd or 3rd grade. The highest grades are not sold to markets and only direct to restaurants. The REALLY premium nori is reserved for the best restaurants (*best in terms of relationship to supplier).
5) High quality sushi joints will have shittons of variety with sushi chefs who know how to maximize each cut for optimum deliciousness. This generally means high precision high difficulty knifework ON TOP OF a deep knowledge of multiple types of fish, and maybe some pairing with various marinades/curing/etc. And this knowledge applies with things other than salmon/tuna/albacore/mackeral. Like this:
or this:
or this:
or this:
etc.
I can go on and on, but there are my main points are
1) There is a time and place for value sushi but it is ridiculous to compare it to top tier sushi on a pure quality basis.
2) Top tier sushi is really hard and really expensive.
Have you ever been to a good sushi place that just happens to be all-you-can-eat?
They meet a need but they are never as good as a real sushi meal. They fit the "I need a sushi fix and I can only pay $40 but I want to eat a lot of sushi" criteria.