A sushi place, especially with a crowd of drinkers, is NOT the place you want to split the bill evenly, no matter HOW convenient it is to divide the bill that way. Most places are by-the-individual-servings and some folks can load up on a hundred dollars' worth in one dinner. You and your dainty appetite mostly for the veggie offerings would end up paying for a lot of high-end premium seafood for the gobblers.
I cannot imagine eating raw fish in any form, but Hubby LOVES it, and so I go with him for an occasional special evening, having eaten my own dinner earlier at home. This is the only time I do this, but I enjoy watching him, and learning about the different flavors and preparations---and besides, that food is ART!!
I love looking at all the colors and shapes and presentations of each course.
But it's wildly expensive, and we'd think long and hard before hosting a dinner there. You are wise, on so many levels, to pass on this "treat."
PS---Not even a written invitation can shield you from this pay-your-way thing. We've had to pick up the slack for several guests caught short by wily "hosts" who mailed out invitations, put up a couple of balloons and considered it their share. Plus, once, we had to pay for one of the three appetizers ORDERED FOR THE TABLE by the folks with their name in the "host" line. And then, only because the hapless waiter was caught unawares, and the totty hoorahs pointedly ignored his request of "Who's paying for the blooming onion?" I think the balloons fooled HIM, as well.