Working For Free

To work for free, or not to work for free. 

To over-service, or not to over-service.
Nobody wants to give away their secret sauce for free, but if you give a little of it away along the path to securing new business is it worth it?
Mitch Joel seems to think so.  
In his Six Pixels of Separation blog post, You Should Work For Free. You Should Not Work For Free, he makes a statement I wholeheartedly agree with: 

I don’t believe in working for free, but I sometimes do.