It's not that most of us would not enjoy the challenge of such an assignment, its just that we know that the winning 'bid' will be 3 figures. I would argue that time and headache wise, its probably a $3,000-$5,000 assignment. Maybe knock a little off for having a nice 'resume-appraisal'. And/or meeting a famous person's butler's assistant.
If the nationwide median home price is around $250K, and the median 1004 appraisal fee is $400 (not seen any firm nationwide figure, just guestimating here), that is 0.16%. Scale that up to a ten million dollar home, perhaps the fee should be in the $16,000 range.