Not saying this to disagree with you, but there are companies manufacturing new cartridge copies of old NES/SNES (probably GB but I never checked) games for a fraction of some of the more expensive games. A friend of a friend of mine got a copy of Chrono Trigger for SNES from aliexpress. There are a few "tells" to know it's a copy (one of which is that it looks too new!), but it plays perfectly in his SNES. Your point still stands, but I just thought this was interesting that this market exists.