What is that stamp worth? What are these old stamps worth?

I had that question recently as I was sending postcards out to home owners for a condo buyer. (We sometimes need to dig a little deeper that the properties that are on the market at any one time for our buyer clients.)

What I found out was that the post office has a page devoted to these "nondenominated" stamps.

Here is the link:

http://pe.usps.gov/text/qsg300/Q604a.htm

So here is my question:

If these stamps go to church, do they go to a nondemonimation service???