What are you talking about? Google develops for all platforms but most of its content it's web based. That has nothing to do with the fact that windows is almost banned but OSX and Linux are encouraged. Do you even read before you post?
God i've been reading your posts all along and is getting more obvious that you don't know what you are talking about.
That ITX system you built it's not exactly the same. It's bigger. Also the PSU in the mac mini is internal.
Besides the fact that you should add the price of the OS.
As a Debian user for as long as I can remember, and Ubuntu user from a couple of years ago, I don't get why they try so hard on this cross-platform compatibility. I think the right way todo it is normalize archs, not diversify them.
Apple haters trying to evangelize custom building.
The #1 reason for a company paying premium for a Mac Pro, is SOFTWARE, not hardware.
Anyway, most companies are buying minis instead. Much better performance/price ratio.