How well does ceiling paint double as closet paint?
i hate to break it to you, but closets are usually left with ceiling paint all over them.  its not for the reason of "seeing the colours of your clothes" (thats a good one that i havent heard before), its because when a builder puts paint on, its with a gun.  if you dont mask the inside of the closet, you save time and money.  ceiling paint is pretty tough, hides imperfections in the drywall (very common in closets), and most importantly, is cheaper than wall paint.

builders dont use semigloss anywhere unless the customer specifically requests it (and pays the difference in finishing and painting costs) because semigloss highlights imperfections, whereas flats or eggshells minimize them.

its all about the dollarino