Have you seen the HTC Vive and Oculus prices (PC only)? And they don't already have accessories for motion sensing, so those new accessories are mandatory purchases (Playstation already has the camera and Move controllers, which many users already own). Not to mention that you probably need to get a completely new PC gig to support it anyway (or get a new graphics card that costs more than the PS4+PSVR).
Samsung VR is comparing apple to oranges, it just mobile phone graphics, and it doesn't actually have its own display - you just stick you phone into the goggle and look at the phone in front of your eyes, that's all. And all you can do is move your head to control the game (cos the phone is already inside the goggle, you can't touch the screen to play games) or buy a bluetooth accessory to play. If want to compare, Samsung VR should be compared to other Android VR like Google's cardboard VR, which can be bought at around US$2 (yes, TWO DOLLARS, or less) for actual 'cardboard' version, or US$15 to $20 for better made full devices.