I wonder what the quality is like. If they're anything like the fake Masterpiece toys, the fakes are probably almost indistinguishable. (For the record, the only Masterpiece I have in both real and fake flavors is Bluestreak, and aside from the quality of the face sculpt there's almost no difference between them.)
Somebody must have noticed that the set was in high demand (well, except for Tidal Wave and Metalhawk, who everybody seems to be selling off separately... never could unload mine) and realized they could turn a tidy profit. The number of official sets must have been very limited compared to the number of people who wanted to own one. I wonder if other limited toys like Arcee or Grotusque could be next.
Zob (in the country of the blind, the man who sells glass eyes is king)