People are growing food themselves because they can't afford the supermarket
People's quality of life is going down, that is why you see what you mentioned, not because they want to be 'self-sufficient', whatever that means because working and buying food is just as 'self-sufficient' as spending time to grow your own food
WTF
So you must be one of the guys driving to work in car (paying for gas), standing in queues; then work; then driving to gim (paying for gas & gim); then driving to shopping center, waiting in line, paying for garbage food....
Do you have any time, do you ever see the sun, do you ever look up and feel a snow flake droping on your face, do you know how nice strawberry smells?
I guess you have artifical vagina, your wife has vibrator and your parents made you with artificial insemination - because you have money.
Driving in a car enables me to waste less time on travel, this makes me more productive
Gym allows me to use machines that let me optimize training for a specific goal, this makes me more productive
Time saved from being more productive, allows me to spend time with my children more often
PS: I don't wait in long lines, only monkeys alike the apple fans do that
PS2: My wife and me have our ways to spice up the relationship yes : - )