This isn't really a "pet" theory — just economics. VR represents an entirely new product line, and with Apple's expansion into services, a whole new way to value-add to those services and entire ecosystem; capturing more recurring revenue. This price point is based on new manufacturing costs at a much smaller scale than their other product lines.
It's Apple, so it'll never be "cheap", but it can't remain at this price point and stave off competition for long. Within 3 years they'll either drop the price and introduce a pro version, or release an SE version, that'll still probably be around $2000-2500 — but bringing it within reach of the people who'd normally buy "pro" devices.