My cage pedals are shot and I'm thinking about getting some Power Grip pedal combos for a replacement. However, I'm having some difficulty understanding why anyone would spend $20+ on Power Grips when it seems like every cage pedal already includes all the hardware needed to mount any old $1 nylon straps.
The Power Grip fixie straps especially illustrate the apparent superfluousness of the Power Grip system:

See how the mounting bolts go through those holes in the straps? Why not save 50 grams and just use the bolts which already mount the cage to the pedal body?
Seems like a no brainer, but I'm having a hard time believing that Power Grip customers are really that stupid. You'd think people would at least just buy the $12 spare straps. Am I missing something here?