Furball - "Exposing a realistic front seems to suggest, "see, this can't be a hairpiece ...""

I agree with that actually. i too am much more aware/paranoid of the back and side blend than the hairline.
Plus, i always did a brush forward style before i wore a piece to try and hide my receding hairline. Now i have a better looking hairline than i ever have.. i want to show that off!

As for the original poster's question.. i would assume that most wearers also enjoy showing their hairlines cause they were probably limited to brush forward or combover styles before they started wearing.