@Placholdr
I'd like to do it, but I currently don't have any land

Moreover, this is not specifically about myself: I really believe the whole society would be better off this way
Lots of people have very little money and surely no land, providing them with cheap vegetables would be a strong incentive to consume them

I mean, I have an average salary and I do not buy tomatoes, even though I like them.
If I buy them its for some great occasion.
A person with a low income cannot even consider doing that.