I have some new drywall that I am working on finishing. I have the orange peel sprayed and the walls are primed. I plan on leaving the walls white. Considering that regular primer is white and significantly less expensive than paint, is there any reason why I couldn't just leave the primer on the walls with no paint and just use an extra coat of primer?
This question comes up at least once a week and you might search for prior posts and responses.
Primer and paint are two very different things with different purposes. Primer will not leave the same film behind as a primer does. Paint will not seal, adhere and provide an equalized base like primer will.
Cutting to the chase. You want to use a quality paint store paint, not primer, for finish coats.
Paint stores will be running their spring sales about now and you can buy good paint for what you would pay for hideous box store stuff.