It really isn't expensive. I paid double that and I don't regret it one bit and I thought I would because l was exactly like you thought it was to expensive and nothing that I would consider killer gaming titles. But, I was wrong. It's been the best thing that I have ever purchased for my PC.
I can understand where you are coming from, especially if you haven't tried VR. It's impossible to judge gaming and apps in VR looking at videos and pictures or reading reviews. As I said I was wrong and after using the Rift since June of last year, I think there are loads of killer apps and games out there.
Robo Recall (Amazing game. Anybody who likes shooting games will love this.)
Super Hot,
Arizona Sunshine,
The Climb,
Chronos,
Elite Dangerous, (This game alone makes it worth the cost.
Flight simulaters,
Dirt Rally VR, (any VR car game really)
REC Room,
Star Trek Bridge Crew,
Eleven Table Tennis VR,
Google Earth VR
Medium,
The Quill,
Tilt Brush,
That's not including brilliant experiences like The lab, Blaze Rush, Oculus Dream Deck, Steam VR rooms, Big Screen. Well the list goes on and on.
I find it very hard to go back to 2d gaming now. It's dull, lifeless. The immersion you get from gaming in VR is just amazing.