yes you can slap on hundreds of gallons of paint but have you slapped on interior paint, outdoors, and then gone back and checked on it 10 years later? (I have not myself so I say,?, but it makes sense to me to spend the extra $, if necessary) I have come across many customers who were unhappy with the last person who painted their house...
purvisgs, you can rest assured that would never apply interior paint to the exterior of a customers home. Furthermore, prep prior to paint is equally if not more important than the paint.
Now for a hive body, two coats of any good quality acrylic latex paint (bought cheap) interior or exterior will last a long long time. The interior may fade some over time since it does not have uv inhibitors.