There are two main reasons: 1) It's much easier to cheat (in many ways, adjust random generators to always be in your favour for example). 2) There can be dif

There are two main reasons: 1) It's much easier to cheat (in many ways, adjust random generators to always be in your favour for example). 2) There can be differences (the differences are how he has been caught) -- it's common that games in emulators are faster as they don't bother implementing waits of various kinds correctly, as most games still work fine (often better, as they'll skip less frames), and it would just make your emulator slower.