My thoughts Exactly… Why waste server resources!
I too am new to WordPress and am a Long Time GreyMatter user.
The static pages are Much more “server friendly” in that a Very Hefty .htaccess file does not have to be read with each request and sql resources are not used.
I’ve just downloaded the WP_Cache plug-in and will give it a try. The plug in may very well be the defining factor for a “Total Swith-Over” from GreyMatter.