I can buy that -- but here's the thing. If you were going to paint, you'd go and pick colors, and then the people who were going to mix the colors for you would ask you what finish you wanted. And when you said "Oh -- I don't know!" they wouldn't decide for you; they'd show you the options (e.g. flat, eggshell, semigloss, glossy) and you'd pick what you wanted. And I'm just puzzled why, when presented with these choices, anyone would pick flat instead of eggshell for any interior surface.

:-)