It depends, MP01 was full of metal, if anything its worth to pay a bit more.
MP10 is like smaller and cost just as expensive, so is like a "please explain the justification?"
Like said, if you bought the new cars at about $60 each, that's a fair deal. anything above is like I have to consider if that character is worth it.
Would you be agreeing the Takara cassettes are overpriced? After seeing Hasbro's, I think they are.