I'm fairly sure you don't have to be living in a mansion to buy a latte or two (per-month, not per-day).
To be fair, the demographic of most net-steaming users with a computer and network connection good enough to stream is probably in line with the "latte or two" crowd, at least around here. I'm not really sure about the DVD shipment service as I don't know anyone who uses it (not even sure it's *offered* in Canada, where I live).
Most of my friends - even those in the lower-income brackets - still stop at Starbucks every now and then for an overpriced drink. After the first two you've already passed the price of netflix in a month.
A better comparison might have been "a movie rental" though, as even one of those at many video stores hits pretty close to the monthly cost of either netflix streaming/delivery services.
You have no friends in the lower income brackets - your comment screams it.