[squarefoot]

Given the use and current draw, it would probably require a fully 802.3 compliant active PoE adapter, which would add some ~20 bucks to the cost.

[johnwalkr]

And a lot of power (probably same or more than the device itself). Some space on the board too. While I think it would be nice to include on the board, it is for sure the better option to not include it and let people use an adapter for their use case.