Not to mention, flaunting wealth by conspicuous consumption also comes with its own kind of social stigma, even in upper class circles.
If the Lego family uses business jets to go on vacation, then they need to 1) pay market rate for using the jets and 2) pay full income taxes, VAT etc.
Anyhow, when you are rich enough this tripling in cost does not really matter - but it does reflect in the income equality statistics.