This is soo very true.
Nexus only pulls 200 watts from the wall and does 30k ppd.
When -bigadv comes to A3 I'm expecting a bump to 35k or more.
Now if SR-2 ever shows up, I wont take anything less then 50-60k ppd on ~300 watts.
Thus the reason I want to build 2 SR-2s. The pull from the wall is about what it takes to run 3 GX2's. Yes, the initial cost is high, but the reduction in long term costs (electricity) will make up the costs and still triple my current output.