I thought it amusing that they were offering the 2005 set, just to clear them out (they are like half price in their club store at the moment).
The Energon set looks to be everything the full (Iacon) registration has, except the boxed set of toys - you still get the 'free' attendee figure (which must mean they have heaps of them prepared - with the intention to destroy any they don't give away). Then again, if they reveal it this week, and it is a good toy, they might sell out of that as well from people who pre-register one of the 2 alternative packages just to profit from the attendee figure.
I still think they should have a non-attendee option, but maybe only for those outside of Nth America to prevent toy scalpers from scooping them up. And definitely only available after pre-registration of attendees close, as reward for actually wanting to attend the convention and not just profiteer off the exclusive stuff.