No way these guys are going to any reasonable grocery store or even a farmers market, they are probably eating out twice a day at that rate, especially in the US where you can easily feed a family of 4 for a week under $100 in groceries.
A latte for 2 at Starbucks every day + the occasional croissant: $400.
Sponsored lunch at work for 2 during the week at $7 per: $300.
With the remaining $1000, you still need to cover breakfast every day and evening dinner for a family of 4.
You don't need to eat out at a fancy place twice a day to get there at all.
It's a pretty normal behavior for an upper middle class family.