Whatever it is you are trying to argue in your comment, it has nothing to do with the cost comparison I am making.
A kilogram of rolled oats can be easily found for about $3; white rice around $1.50 if you shop around; pasta from $1.33 to $2.22 depending (usually on the higher end of that); white flour $1 (in large bags).
A person can have a sandwich made of bread ate before your rolled oats are cooked. I think a huge portion of some people's confusion on why people eat what they eat need to look at time from picking the item from the panty to mouth to see that people spend a lot less time in the kitchen then they do.
I enjoy rolled oats uncooked in a bowl with milk and various berries sprinkled on top. Try it, for me they are more delicious uncooked!