Wake Forest University Baptist Medical Center has benefited from the services of a world record setting volunteer.  According to this article a fellow named Don Moss has volunteered over 47,000 hours of his time to WFUBMC since 1982 and has been recognized by the Guinness Book of World Records for his efforts.

If WFUBMC had paid Mr. Moss $5 an hour then it would have cost them $235,000.  I picked $5/hour because it's a nice round number that makes it easy to do the math and kind of the middle range of the minimum wage from 1982 until now.