-daycare in this city costs as much as your mortgage and probably more
-a 2 bedroom in a nice area is going to run $4000 minimum, probably more
-the effective tax rate on "high" income couples is near 50% (take home is $18,000 per month)
-private school after day care (public schools are a nightmare unless your kids go to Stuyvesant, etc)
Add it all up and that 18k take home pay turns into 2k in a flash.