Quick answer as to why it's done randomly like this:
$$$
Another way to think of it is like baseball cards. Think of how many people would love to just get the baseball cards they WANT rather than go to the trouble of sifting, trading and hoping to get!
But I'm totally wih you, I WISH they didn't do it either, especially at their price points.
But several Japanese toy companies currently are, and I just deal with it. Simply, as long as we keep paying for it, they'll keep doing it.
But damn that chase cockpit is sweeeet!
I love mine!