Need more power? Then buy a Mac Pro and have more power in a small container than I ever has when I used to build 400 seat call centers using Mac Server before 2000. (No, I wasn't the Mac Server guru, so I accept criticism that I know nothing).
Was Mac software perfect? Nope. One of our team members had to rewrite the Apple UDP stacks, and push Apple to admit he was correct.
Still, one or two Mac Minis would easily power fwdude’s server requirements. Storage can be added, the Mac software seems easier than comparable Linux server software. And it costs $20.00!
Will the software ever tempt BoA or Facebook to radically change their server and storage strategy? Never, it's the wrong solution for them.
For the millions of small businesses that pay a small fortune to keep Server 20xx up to date and safe across a network, it looks like a great solution.
Would you build an enterprise data center out of them?