you CAN grow your own food.
after the system is installed and planted, it mostly takes care of itself.
I ask you...
what would you rather ?
if you want a tomato, to drive to the store, pay a couple of dollars, drive back and prepare a tomato that probably has pesticides on it, grown with other chemicals, low in vitamin content, and tastes like cardboard ?
OR...
Would you rather go outside,, and pluck a high mineral tomato with no chemicals, in much less time without the pain of going to the store.
the added benefit, is no long term transportation, refrigeration etc...