correct me if im wrong but it sounds like ... if i got to a junk yard to buy a part i can only do so thur a local repair shop , or was this a bad example ?
Think of it like this:
You want to sell you 1999 Toyota Camry to you neighbor in order to do so you would have to go to your local delaer to process the transaction.
If you want to use Autoparts it would go like this:
Your friend Joe has a water pump for a car you own and he doesn't want it so he is selling it to you. In order for him to transfer said water pump you need to go to your local parts store to process the transaction.
It is about face to face sales being prohibited without going through a dealer.