Also keep in mind that redecos and minor remoulds are a necessary evil if you don't want to be paying significantly more for your Transformers toys.
"Milking" is really only applicable if there have been several uses of a mould and a new redeco is hard to explain or has little or no history as a toy character (like black redecos, themed redecos, or more specifically, Acid Storm/Sunstorm versions of any Seeker mould once they've done the basic three).

The first two or three uses of a mould is what keeps it below a certain price-point... and if they are different established characters, it's not as bad as a fourth or fifth redeco that has a weird colour-scheme to it.

31 uses to a mould... now THAT is milking.