Can you explain how you "love" the games, but want them all sealed? How are you going to play them?
Not trying to troll. I'm honestly trying to understand the motivation of sealed collectors.
The TG16/Duo plays burned CDRs. The Turbo Everdrive plays all but two games (I think) in the entire PCE/TG16 library. We don't need original media to play the games, at all. Yet, some people want every hucard. Others want every game, complete in case; some here want every game, complete in case and original box. You can't "play" with the case or cardboard box. So, there has to be something beyond "just playing the game." It is collectability. Sealed games are just for another level of collector.
I don't care for sealed games, but I don't think people should malign others for what they value. If it makes someone happy to have an original, sealed, untouched copy of a game, and are willing to pay for that privilege, I don't see a problem there. Life is too short to spend too much time worrying about what makes other people happy, and getting angry over it.
If you have a copy of sealed game for him, great, if not, why not just move on and leave him alone?