>>10105757$550, for a really weird looking figure, that has a main gimmick of allowing you to put the other buildable iron man inside it. So the torso is really bad because of that compromise. Also apparently the figure has a decent amount of parts that fall off a lot if you hit it or touch it wrong. It is a neat concept. Just check for yourself.
Add that to the point where people didn't like the last hulkbuster all that much, and this doesn't help.
Premium price = premium scrutiny