I’m not underselling anything. I believe a quick napkin calculation will show that it’s roughly in the right ballpark.

• Private jet: 100 million USD each (reference)
• Superyacht: 500 million USD each (reference)
• Sports car: 150 thousand USD each (reference)
• Mansion: 10 million USD each (reference)

Total: 741 million USD

Most billionaires keep most of their wealth in actual investments (stock, bonds, Caymanian bank accounts, swimming pools filled with gold coins). Though this information is not public, let us assume that only 10% of their wealth is contained within these “lifestyle” objects, which is likely an overestimation. This would give us a total of 7.4 billion USD

Given the actual average wealth of a billionaire to be 5.3 billion USD (reference), I maintain the objects I have described accurately describe what a typical billionaire would be able to afford (if not slightly more than they could afford, actually).