Because it's a waste of time.
Rackspace is trying to keep everyone focused on the hype of the cloud, to keep racking in your dough.
One "Cloud Server" with 16Gig of Ram and 4 Procs with rackspace would cost me $700+ .
I can get a third of a cabinet from CoreNap for less than $400 Month. I can fill that space with vastly more powerful hardware for about 5k. ( Shopping Smart )
Now lets do the math assuming a hardware life cycle of 5 years.
400 x 12 == 4,800 ( one year )
4,800 * 5 == 24,000 ( Five years )
hardware: $5,000
52 weeks in a year times 5 years == 260 weeks.
Spread the cost of the hardware over 5 years. ( Cash outright or lease )
$5,000 / 260 weeks. == .01923 per week for the hardware.
Not worth adding to the 24,000 you will spend over the next 5 years, compared to the 42,000 you will spend for a single inferior server instance at Rackspace.
And you're not eliminating engineers by going to the cloud. You still need admins.
- Dan.