And crash twice as much, give perplexing system errors twice as much, take 10x longer to boot, etc.
Funny my Vaio TT in time I have owned it had the same number of crashes as my MBP during the same time. A a combined total of 6(3 each). Now my iBook that's another story. It mostly depends on the user and the activities one does with the machine. If you know what you are doing neither computer will crash.
I will admit the prospect of a quad core mini sounds great, but I doubt we will see more than a dual core Mini update, for the sole fact that a quad core may take away sales from the iMac, and maybe even the Mac Pro.