Once you own your own cow, cow get lazy and not producing them anymore.
Just like when you get married, your wife will get fat and don't want to have sex with you anymore.
That is why Apple Inc. never try to own their down line manufactures. They want their down line to compete with each other so they will get the best and most efficient pricings.
Your analogy is not very succinct. Apparently you never lived on a farm or ever milked a cow. Typical townee.