That's strange. I have used Nexus phones since the first one that came out and I have never experienced any significant battery drain from either wifi or bluetooth. First was always screen, second Android system.
Just checked again to make sure. Wifi 0%, Bluetooth 0%
I just wanted to mention that I've done a full factory reset of my phone now, and it seems that wifi is using a lot less battery, even with wifi scanning etc. switched on.
Just checked again to make sure. Wifi 0%, Bluetooth 0%