I would think Stanley Ho is bad example.
Maybe he is good at hiding his assets but for someone who was known as casino king, his net worth was always not 'up there' with the big boys.....even genting boss was worth much more than him.
When he was healthier he always threw lavish parties, one notable one was a birthday bash that lasted for days where he invited all the women in his life...numbering by the proverbial bus loads.
Li Ka Shing would be an example of a low key tycoon.
The weddings of his sons were all simple affairs and he once walked out of a restaurant after looking at the menu citing prices were too expensive!
If u want to know the truth, the really rich tycoons never do this kind of thing. They are always very low key and unassuming. The nouveau riche ones from China, maybe are showboating or flashy, But their fortunes are numbers in the hundreds millions $ or low $billions, whereas the old money tycoons who have multi-billion $ fortunes never like to let people know how they spend their money. eg. Stanley Ho at the peak of his power and wealth never booked entire luxury hotels for parties even though he owns several.