Not the person you asked but: I have met people that became wealthy and acted like you describe and they usually ended up broke some years or decades later. I've also met some extremely wealthy people and they in fact were visually very modest (but worth more money than one could spend in a lifetime).

The contrast runs something like this: German dude, worth $10M made his money in real estate, started an online company, lost it all but bought Porsches and hired fancy places, in the end turned to crime in order to continue to finance his life-style.

American dude, worth > $50M (at one point...), spent money like it was toilet paper, golden taps in the bathroom, fancy Rolls-Royces (multiple...), used to be the #1 in a hotly contested tech field, lost it all when the market turned and he didn't adapt.

Swiss dude, worth >> $1B, modest house, drove a VW Golf (ok, a nice one), absolutely incorruptible.

They're nice examples to have and I understand that for someone worth that much there is no need to signal anything and that Germany guy may have had to keep up with his 'circle' in order to be seen as successful but still it makes you wonder how much pain there is behind all those frustrated faces in fancy cars living in expensive houses.