Is there anything inherently wrong with ARM servers that give you legitimate reason to immediately balk at the suggestion? As far as I can tell, ARM servers are no less reliable or speedy as x86 servers. They just cost less to own and run. In fact, there's already a sizable precedence of ARM server clusters like EC2 (and including EC2). See:

[1] http://www.ubuntu.com/download/arm

[2] http://www.h-online.com/open/news/item/Canonical-releases-EC...

[3] http://arstechnica.com/information-technology/2012/07/your-v...

[4] http://www.phoronix.com/scan.php?page=news_item&px=MTA5N...

Yes this argument is becoming true with time because ARM is really gaining phase. But we have Virtualization and its already cheap and works best at the moment. I dont see why anyone should go for separate ARM server ( in normal scenarios of course ) instead of using virtualization