It's funny, I emptied a bag of growing potatoes today, they were being grown in "stuff" compost from the garden, and I got a large punnet of spuds out of it. Enough for about 3 family meals. I was thinking about the monetary value and about the effort if takes to chit them, earth them up, water them and then wait to harvest them. The answer is simple........the effort is priceless when you have a meal in front of you that you grew yourself.