Well, to put it simply people lose interest as time goes on. With other things coming out or tastes changing people aren't going to clamour over the same things as much as they did around the time it's released. On top of that 3000 is still a fairly large number and so many folks buy things to sell later or save hoping they'll go up in value. In other words these things aren't scarce. It's extremely similar to the comic book fiasco in the early 90's.
good point mando, guess then thats why they are collectibles and not "investibles".Guess i am just trying to justify to myself why i am spending alot of money per month in purchasing one figure!