"In an interview at his Silicon Valley office on Friday, Mr. House revealed PlayStation VR’s sales for the first time, saying consumers had purchased 915,000 of the headsets as of Feb. 19, roughly four months after it went on sale."

https://mobile.nytimes.com/2017/02/26/business/sony-playstation-vr-sales.html

Wel it is a peripheral that's more expensive than a PS4 pro.

why not just wait a few weeks and announce a million

Finally, a solid number.

what is a good number in 4 months for a $400 peripheral? 

that is a good number - ofcourse there won't be "AAA exclusives" for the PSVR any time soon, but I hope more and more games get VR patches like Dirt did

As opposed to the estimated 243k for the Oculus Rift and 420k for the HTC Vive, such a tiny number indeed.

OT: as a developper, I still wouldn't see why I would develop a game for a 910k player base unless I'm hella confident my game will help increase thet player base in a meaningful way.

4 months to reach 915k.... well its not so bad, not fantastic nrs either though.

Seen in that light, its actually doing pretty well compaired to the other VR headsets.

also:

"Sony’s internal goal was to sell one million of the headsets in its first six months, by mid-April. The company will almost certainly surpass that forecast."

I'd say it is what it is. There are no big feats to be expected by tech at early adopter level.

Just not enough to develop a major game for it. It's questionable at this point whether or not its even worth making an optimized VR mode for a game like RE7.