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Second of all, this is a convention issue, like tabs vs spaces, it could be one way, it could be the other way, in that sense I don't see how arguing that it could be the other way is helpful.
Either restaurant bills can be higher, or they can be a tad lower and tip is soft mandatory. It doesn't make much difference which way it is, the end result is the same. There's problems if you come from other conventions, in the same way that your device might burn if it comes from EU and you don't have a transformer.
Quit reading there.
I am off the hook for your food, shelter, healthcare in our culture.
Social media has people in their living room demanding others respect that; but we're at home or other personal context ... everyone is hosting so no one dictates house rules
Social web is dying cause everyone caught on its just a bunch of entitled Americans expecting the same treatment they would get in their cul de sac