To me, the Exo Suit is what a Lego "bubble" looks like:
Plenty of hungry QFLL tried to cash in, Lego made more, all the investors/QFLLs said "Eff this. It's junk. I can't double my money immediately," and now piles sit and wait for a home. Since it A} isn't licensed (NASA, like the Rover), B} doesn't fit another current theme (outside of IDEAS), and C} didn't have an accompanying media frenzy (ala Research Institute), it's dying a slow death.
I still love it. I have have one built for me and ten in a box waiting. They may never sell, but they are a tiny, tiny fraction of my investment portfolio. I'll hold on to them for future AFOLs to crawl from the dark ages and say, "Damn, I wish I was around when that thing was available at MSRP."