I am 100% certain that we can ID ‘what is it is not’But it IS A NECESSITY! You do not understand. This is a ONCE in a LIFETIME event. Don't you get that? Many people, my sister for example, this is a necessity. What you think is a necessity or not is irrelevant to others.
Gas may be a necessity for you one day, but not anyone else. Just because you don't want the food you still have in your house, does not make buying more food today a necessity.
Not certain we can ID "what is or is not" for for others. I do think price gouging is much easier to ID.
And I am 100% certain that this is NOT a necessity for your sister.