I am not sure what you are talking about. Do you mean game cartridges with complete saves on them? I assume you mean level 100 rather than HP.

I think most people buying cartridges are looking to either collect them, in which case the condition of the cartridge and associated box and manuals is much more important, or play them for themselves, in which case they would wipe the save anyway.

Plus those older cartridges have battery backed memory. Unless you have replaced the battery, the save capabilities will have long since stopped working.

Why am I getting notifications for this post?

Wait, are you claiming to have a legitimate event Mew from back in the 90s? Provided you can prove its legitimacy that might be worth something, though I would be amazed to know how you preserved that. Have you changed the cartridge battery?

Again, if it is played, I think most people will generally not care about the save. They either are collecting the game to display or are going to overwrite it with their own save. What would you even do with a completed save?

Almost certainly not.

Did you bookmark it accidentally?

There seems to have been an update on the forums that broke a few things. My posts held for approval are often duplicated multiple times after approval.