Harlan Ellison on working for free.
Undercutting is something that many a professional artist has to battle on a regular basis. In the bellydance world, it seems to happen when a new dancer has dreams of performing and offers to dance in a venue for less than the going rate. I could go on and on about the perils of undercutting, but Harlan Ellison sums it all up quite nicely. Just watch.