We're one of the only game dev companies in the area(Buffalo,NY), we also have a strong relationship with the Buffalo Game Space(NPO dedicated to game dev education, which I'm also involved in). As such, we often offer internships to a lot of first/second year students as an educational opportunity to get involved in the business. Those ones specifically are lower paid. Minimum wage if they "work", unpaid is it's solely educational(i.e. they'll basically just be shadowing someone), and for senior/graduating interns we pay competitive $15/~.
So in our particular case, we often deal with low-skill interns as a way of giving back to the community here. Though I'd say you're probably generally correct