Not to defend big companies, but big companies have larger operating costs and they have more corporate responsibilities, to companies and people who fund them.

AAA game costs tens or hundreds of millions to make. Indie game can be made with 50k.

When game costs +40 million to make, you really cant take much risks and cant expect that the guys with the wallet wont want to interviene with you.

Personaly i have much easier time to identify with ugly old males than teenager models.