The administrative overhead of deploying all this stuff is incredible as are the disparate infrastructure and software models. You might be saving 11x on an Azure instance, but your ops time and staffing requirements will cost more than that. Throwing something on Azure is really cheap with respect to time and effort. If you need to scale past that or cost becomes a limitation, you might as well fish out for a Rackspace or other dedicated package.
We're at the £50k hosting budget a month mark now (1x production DC, 1x hot spare DC, 2x packed 42U racks in each) and 2 meat based products to manage it all. Not much of that cost is software licenses.
Note: I have nothing against servicestack - in fact it's rather good (we use servicestack.text)
For ref, I turned down a position at 7digital a couple of years ago as I though they were smoking crack when stuff like this was mentioned.