Dawnguard costs $20
$20 is 1/3 of $60
That means, that if this DLC contains less than an equivalent to 1/3 of skyrim's vanilla content, this DLC is overpriced.
BUT, if this DLC contains an equivalent or more to 1/3 of skyrim's vanilla content, then this DLC is rightly priced.
Bethesda, I'm really hoping this isn't a rip-off.