The ability to manipulate objects is great to foster understanding of our world and development of spacial visualization. Apparently there are some people who don't understand how to properly put an air filter cover back on in their car because they don't understand it just needed to be rotated 90 degrees, which is honestly incredibly sad. The benefits come from brain development and understanding how things work together which, if you want to think about it in monetary terms, helps in any industry. Everything is an interacting system.