For the same reason that the "Real Housewives of 'X' or 'Y' do it". Because it's a visible affirmation to themselves of how rich they are. The fact that they can afford to "stay young and beautiful" is something that they are better than us peasants for.

MAGA, following the lead of Trump, have a very very gaudy idea of what it means to be "rich". It's all gold plated everything and showing your wealth as obviously as possible in every possible situation. Someone once said that Trump is "a poor man's idea of what a rich man looks like". And that's pretty accurate. To Trump and his MAGA followers, wealth is to be flaunted as a show of power.