> I think one can always debate this but the fact remains that static pages served by apache will any day be faster than any sophisticated cacheing engine.
Nice, and? HTML 3.01 is faster to parser than XHTML and CSS. man pages are even cheaper.
But the point of software is to save human efforts, not CPUs. That's to say, if you use WP and want to save lot of CPU without losing (well, almost) any dynamic feature including users' preferences, use WP-Cache, which provides order of magnitud improvements (in the same order as static pages).
If you don't like WP and want other blog software that produces static pages and hardly publish any comment in "real time", go ahead... Save CPU time, waste yours :-)
PS: I really don't understand your reasoning. WP gives you lot of nice and useful features, WP-Cache bring the response time --and cpu usage-- down to "almost" as static pages' response time. And everything for free --in every sense--. But, yeah, you are arguing about the difference between "almost" and "same" [time]. Strange, to say the least.