Not sure about the Caad10 but my 9 doesn't have any way to mount a rack. That said, I was told there are solutions though they sounded less than ideal. In any case, I don't think a caad, or any race or higher performance bike for that matter, would make a good grocery getter for pretty much the reasons you identify and the difficulty in adding a rack for carrying stuff. Unless there is something wrong with it, however, like doesn't fit, I would keep it and enjoy it for it is - a great riding bike. Get something else to run errands that you don't mind locking up. Yes, that means spending more, but you will have two bikes instead of one and $700 down the drain.