The problem is the concept of, "trash".

Trash mobs
Trash loot
Trash this
Trash that

Of course people don't want to waste their time on that. It's why you don't really see people out in the world just fighting random monsters. It's not engaging enough to be fun, and it's not rewarding enough to put up with the tedium. As long as that's the case, people aren't going to want to bother with it.