I do think it's overpriced. I don't understand why companies do that. It can't be more than a ten dollar part. But who knows. Maybe they don't sell enough so the price is high? I'd probably get the ety myself just because I feel like I know I'd be getting the exact sound quality I should be getting.
And I'm the sort if person who buys $10 hdmi cables and generic speaker wire for my multi thousand dollar home theatre setup. Ha. (Seriously)
I doubt there's any quality difference, but that's just me.