Sinply put, most working class parents simply don't have the financial respurces to support an older child's artistic pursuits. It is a privilege, i.e., an _advantage_, to have those means and werewithal to do so.
My point being that it’s not about finances, it’s not that much more difficult for most working class families to support an extra mouth to feed, especially when it’s an adult. It’s more about the difference in perspective and future financial stability.
While typing it, I realized it is actually more expensive in US than just a mouth to feed. Medical insurance, car insurance, car payments (you need a car), all add up to much more.