Don't you mean over priced?Slower slightly slower single threaded performance and a sub-1000 point difference in multithreaded performance are worth $1,000? The 2.8 is still a better deal, especially now that their prices have dropped considerably.
The new Mac Pros on the other hand are still over-valued for their modest performance gains.
Really, we'll have to wait for other vendors to release products, but I somehow doubt the '09 MP will be less expensive than their counterparts this time. Perhaps very similar, but I've a feeling, they may be lower, given what is possible going DIY. Usually not an extreme difference using identical, or nearly so, parts. Seems to be somewhat similar in cost, comparatively speaking.
Obviously, a vendor has to include things like assembly costs,... but the system is ready to go, and comes with a warranty from a single point of origin, rather than from individual component manufacturers.
To me, that's the real cost of DIY'ed systems.