Might be wrong, but believe the point was not that $1500 is unbelievable, but per the data you linked to - that the “median household income worldwide is $9733“; that and the OP posted $1500 is above and beyond there needs; worth highlighting that is household income, not individual income.

There’s a massive difference $811 a month and $1500 month; $811 is $9733 divided by 12, though really should be the divid by at least 2, since by definition household has at least 2 members.