Depends on how much time and money you have to spend on preparation and ingredients. I know 3 couples who have eaten at the Fat Duck, all said it was an amazing experience but none said it was worth it, and wouldn't go again. If he can persuade everyone to pay for it once in their lifetime he can retire a happy celebrity.
I've been twice.
Once for lunch and once for the full works for my 50th.
Would I go again? No, because there is a mental game played on each course - once played the surprise is gone. With a new menu, I would be there!
I have eaten several times at his pub in the village and his Hotpot and steak pudding were each the best example of each i have ever eaten. I'm looking forward to eating at Dinner sometime soon.