Here's just my thoughts on the matter.
In previous iterations the Nexus line up was a relative of a current flagship device.
Samsung Nexus S - Samsung Galaxy S
Samsung Galaxy Nexus - Samsung Galaxy S2
LG Nexus 4 - LG Optimus G
LG Nexus 5 - LG G2
When you compare each device (the links will take you to phonearena.com's comparison) you'll see that the Nexus line was always a shade 'lower' than the relative flagship.
Whereas this new Nexus 6 the closest relative would be the Moto X 2014 version. And if you check our own 'flagship comparison' on the database page you'll see that the comparison of the 2 devices is nowhere near each other.
|Moto X (2014)||Nexus 6|
|Processor||2.5GHz x4||2.7GHz x4|
|Type||Snapdragon 801||Snapdragon 805|
This phone isn't the 'slightly modified version' of previous devices. It is a full blown flagship on it's own.
We need to stop comparing the Nexus 6 to the 5 and 4 for pricing and more to comparing it against the other flagships...
Let's see how it compares to the Note 4, Z Ultra, G3 and then we can start talking about how out of line the pricing is. Against the Note 4 it is quite well priced.
Anyways, that's my 2c on the matter. What do you think?