I'm not sure that anyone here can really say why CYs don't offer elites breakfast, but there has been quite a bit of speculation here on that.

A good thread on this is the http://www.flyertalk.com/forum/marri...courtyard.html.

The http://www.flyertalk.com/forum/marri...ield-inns.html thread has some interesting comments as well.

There are other threads as well, but these will give you a bit of some of what others here have said about the CY breakfast concept.