What percentage of American children live in poverty? According to the National Center for Children in Poverty, 16 percent of children (20 percent of children under age six) in America live in poverty. The child poverty rate in America is often two to three times higher than that of other major industrial nations. Poverty is defined as living in families with incomes below the federal poverty line ($21,200 for a family of four in 2008).
The main cause for tire cupping is worn suspension allowing too much freedom for the wheel to bounce and vibrate, specifically shocks/struts and bushings. If your wheels are going out of balance, this issue is greatly amplified.
Depends on where the cupping is. If it is somewhat evenly spaced around the outside edge, then the most likely culprit is a bad wheel balance, even if you don't feel the vibration. It could also be from badly worn steering/suspension parts. If it is on BOTH edges, then I would look at the steering Rack-And-Pinion gear for loose/worn mounting bushings, or a tear in the firewall mounting.