I can sympathise with peoples feelings, but if collecting makes him happy I can’t really argue with that. He has just as much a right to disagree with us, as we have a right to disagree with him.
Side topic: I assume collecting sealed Hu Cards is a terribly risky proposition. The vinyl sleeves would almost certainly be melted on the plastic. In addition, I’ve found that removing the sleeve sometimes takes part of the artwork/paint with it. :/ You'd probably want to open the games and remove the sleeves as soon as possible. But that's just me.