I was Hesitant to say anything, but we dropped more than that for me, Mika and James at Nobu's and about that much for the two of us at The French Laundry.
Yup.... 320/4 = $80/head... - at a decent restaurant that is a very fair price - if it included wine it is cheap!
Definitely the law of diminishing returns - but sometimes memories are priceless.......*
*I really wrote that? Excuse me whilst I puke!