I don't so I have no intentions of buying PS+. It was nice being able to play online with games like The Last of Us, but I'm not spending $70. Every PS4 game I'm looking forward to (Death Stranding, Days Gone and Crash) or already own aren't multiplayer heavy games so I can't warrant the purchase. I play FPS's and multiplayer on Xbox.
Sony knows most of their player base has no choice but to pay for it so that's essentially why they did it.