By being a nice person, just like how one would hold open a door for someone else? Though, that aside, when you say "Guten Morgen", you aren't wishing anything. It's just being polite while at the same time, you are saying something about yourself. For example, you could simply say "Morgen" which would mean you are in a hurry, or, depending on how you said it, that the morning isn't good at all. There are a lot of applications for "Guten Morgen". It all depends on how you say it and in which situation you do it. Anyway, it's not comparable to the questions in your posts as "Guten Morgen" can never be fake. Something like "Wie geht's?" (how are you?) would be more fitting, although it's rarely used as a greeting and more often than not, it would be meant seriously.
