If someone is offering you All-You-Can-Eat sushi, you should probably ask yourself why that's happening. Isn't sushi expensive? Well why the fuck are they offering you such a good deal?
Is this sorta like those day old donuts that some donutiers try to pawn off on the public? Aren't the consequences of aged fish a bit more drastic than just some old fried dough? Proceed with caution people. I dodged a bullet, but you might not.