Up to a point, expenses are elastic and proportionate to income. Across different incomes, things like "dinner" or "cocktail" mean (and cost) very different things, to the point that someone on either end of the scale doesn't even know what is on the other end. A very wealthy individual might not know about the $1.50 Costco dog, and a less wealthy individual won't know about the $10,000 bottle of cab sauv (okay I'm making that up, I don't know either, but you get the point).
If you have $100k you'll make do with that, if you have 10x more, most people will find ways to scale the expenses accordingly. If you have 1,000x more, that's just wasted cash that does nothing for society, but that's another discussion...
I was highlighting partially how it's just generally expensive to host the first time a large group.