Also the VERY VALUABLE Skylanders weren't just produced in limited numbers, they were unbelievabley rare 1 in a million (not exact figures but you get the idea). Aside from those, there were trade show models/giveaways also crazy rare. The store exclusives from year 1 are also worth a little.
With aiimbo's you have nothing like that. Even the hard to find 3 can still be found if you try hard enough/order online and there is a good possibility they will be restocked.
In short if you are hoping to buy gold your best bet is Marth, wft and villager but don't hold your breath they will be all that valuable. It really depends how limited exactly they end up being.