And if the host does spring for some sort of hosted bar - say a limited bar - it would be akin to slapping them across the face to buy an upgrade. It would be no different then saying "what you provided is awful and unfit for my consumption and I will pay my own money to not consume the swivel you have provided."
I respectfully disagree. I think in this situation it is the host who is taking into consideration the individual guest preference and giving them an additional choice.
There is nothing to disagree with - because its not a universal. My post was about the norms of my
area and my
social circles. That was my point. In some places cash or partially cash bars might be fine. But they are not fine everywhere. Not to have, not to utilize.
experience in your
area in your
social circle it might not be a terrible insult to buy an upgrade at the bar. But I can tell you without hesitation that is not
a universal. In some places/in some social circles you would be seen as behaving terribly poorly for doing so.
ETA: Its like burping at a dinner table - in some cases its perfectly fine, in fact a compliment to burp at the dinner table. In other cases its horrible gauche. One can't say it definitively is one or the other because it varies by social group.