The both the original U2 iPod and the new one DO NOT come loaded with U2 songs. iPods don't come loaded with songs because iTunes does not allow you to pull them off (normally - yes there are ways, but not supported). They come with coupons or codes to download the content so you have it on your computer and then sync to the iPod. The original U2 edition came with a $50 discount coupon for the Complete U2 set. The $30 extra is for the signatures, the exclusive coloring and the exclusive content.
Even if it did come "loaded" with every U2 song that a fan already owned, I hardly think an additional $30 over the price of a normal one would be considered equivalent to "paying twice" for the songs you already own. Anyway, that's not the case, so just drop it. If you are not a U2 fan, just ignore this model. What's so hard about that?
What's so hard that people can't just go to http://www.apple.com/ipod/u2/ and check the specs before shooting their mouth off or playing totally misinformed callers' rantings on their podcast.