Tooooo many words! Just kidding seriously though I have never ever expressed a thank you and didn't mean it. Of course certain situations cause a greater feeling of gratitude than others doesn't mean either is less valid. I think maybe we're over analysing a little bit. And my kids have manners and have a very good understanding of gratitude We had an awesome discussion less than a week ago about apologies and not knowing how to fix a problem and empathy. Was an hour long conversation. Started over a fight the kids had. And since then both have been practicing how to show empathy (Not have it as they both do, but expressing that in situations that need it is something they are learning). My point is niceties aren't bad things, teaching your children etiquette isn't a bad thing, and if I were in another country I would adopt their traditions in order to not offend etc. I see no difference here.

In seriousness I've never harboured I'll will over a thank you lol.