Thoughts on justifying corporate attorneys fees.

When I am wearing my M&A hat, its pretty easy to justify my fees,  However, when I am merely revising contracts or doing other corporate work, even when the stakes are big, I will occasionally get some push back.  I have been thinking a lot lately that the true measure of what I do is the value of the lawsuit that is not filed.  Has anyone used this argument successfully with a client?  If so, how did you approach it?  We all know that money spent up front with a lawyer often saves big money later, but how do you quantify it in terms a client can understand? 
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