Several things factor into that huge price (and that's pretty darn high for an AF page, but not surprising). The issue is as key as it gets for JB's run. If you're looking for a page, you're probably going to start with #12. Northstar is popular, as is Puck to a lesser degree. Number of panels, and the fewer the better. The characters being in costume and using their powers are both prime reasons. All things being equal, if a page with these exact details, but from the battle, were sold, it'd go for even more.