Maybe, if you can find a place that will deliver you a more-or-less similar quality pizza without the delivery fee, tax, or tip. But you can't. Yeah you can pick up a $10 pizza from a mom & pop that will arguably be
better pizza, but nobody orders Dominoes for good pizza, they order it for consistency and convenience.
If you compare apples to apples you're paying $8 for a reasonably acceptable pizza.