>>5823942btw, that's funny that you think there is any overlap.
If you look at their prices, notice that while plastic is cheaper than diecast with simple pieces, it ends up being more expensive based on the complexity of the piece.
All things being equal, the same detailed piece will end up being more expensive with plastic than it does with diecast by over 2x.
Nevermind the fact that plastic is much easier to paint than diecast, thus giving you a better looking toy.
Nevermind that plastic will have better details as well.
