How many of these parts are genuine? Many of the parts are so specific to the iPhone they can't be generic off the shelf components. Some seem impossible to knock off like the SoC or the touch sensors. If you find a genuine part, that works, is it stolen? Some aesthetic problem? Some defect that doesn't quite render it unusable?
I had to laugh at the hand-drawn logos on the kiosk of the guys who owned the 'Remove Bubble Machine'.