I could totally be wrong but my understanding was that the markup on most Apple products was ~15% (as you say) but the markup on Apple's accessories (headphones

I could totally be wrong but my understanding was that the markup on most Apple products was ~15% (as you say) but the markup on Apple's accessories (headphones, itunes cards) was nearly double that. Even in that case though, you're right that six fifty would be low-ish.