Just Buy Them
Stop wondering if it's really worth the money and just buy them. I bought twelve and it is so nice to be able to walk away from my car with complete confidence that when i come back, my whole rack system will be there. And if I want to take it apart, the same key works with all of the components, from my towers to my ski racks and back again. Think about the amount of money you have invested in your racks, plus the amount you have invested in the gear that is held by those racks, and $110 for twelve cores starts to sound like a mighty good deal.