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The assumption being that the client's are providing truthful responses.

I worked at a PI firm that sent out satisfaction questionnaires alongside an authority to accept the Defendant's offer with the caveat - we cannot send you your damages until you return these to us. How many "unsatisfactory" responses do you think we got?

Of course clients don't want to say they were influenced by price to the people who have just spend hundreds of man hours working for them. Same reason "shy tories" exist, and people say they prefer a dark roast coffee to advertisers when they actually prefer it weak and milky - people lie.