The thing is we really don't now how many they sale as SS has admitted in the past that if demand for a statue dries up they will stop production before reaching the max Edition Size... They did that with Obi-Wan Mythos statue, I believe it had a max ES of 2000, they originally cut the production off at 1400 if memory serves me right, then a year or so later demand picked up for the statue again (on ebay and what not) so Sideshow decided to finish the production run and make the last 600 statues.
When you see SS website say a statue is sold out and then several months later it's back in stock, I think that's why....