You cannot directly purchase the Hololens yet, and even if you could it’s $3,500.
On the flip side, if you've got an actual business case for hololens, acquiring them is rather trivial. And quite frankly for the use-cases I've seen hololens deployed, $3,500 a pair is barely a rounding error in the project budget.
$5,000 mac pro is not targeted to the consumer market. I doubt it is responsible for 1% of Apple's profit.
If apple does VR, they want it in everyones house - not in a few hundred. That's not the scale they operate at.
PS: 28 cores and 1.5TB of RAM is still very much workstation territory. Few people need that, but it’s a solid investment if you’re in that group.
But its still a rather overpriced workstation. However, thats not the topic. Microsoft also charges what the market will bare, but it is a completely different market. MS has been quite focused on their B2B products for a while, so selling the expensive Hololens to companies and not private users makes perfect sense. So if you're in that group, its a solid investment