There is a cost involved in getting more information. The buyer made the evaluation to go ahead with it based on his personal values. This includes his valuation of the price of getting more information for a lowered risk. Now if the deal turns out to be bad, that doesn’t mean he made a bad trade. That would simply be results oriented.
Now when someone else takes over your decision making power then they are screwing with your personal valuation of the price of getting more information.
See also this thread: http://forumserver.twoplustwo.com/41/politics/information-constraints-economincs-acist-question-590287/