The team at facebook will be able to show bigger sales, making the next version more likely. You will count as a "oculus quest user" in steam stats etc. Developers will be more likely to support this headset. Etc etc etc. The market is still so small that network effect like these can be huge.

Facebook is selling at a loss in an attempt to destroy the competition and build another monopoly. They don't care if they don't make a profit now, as they will be able to gauge you later.

Don't buy facebook stuff.