A lot of the people here are kind of social retards. Anyway..
I say if it works, who cares if its genuine. If I could find a fake that works and looks the same but costs less, I'd buy it in a heart beat. Usually the fakes arent worth it though. In this case, I'd say it would be where it's just a cable.
I sell refurbished iPods and iPhones all the time with 'fake' sync cables. Basically because they do the job and are a fraction of the cost. I don't advertise them as OEM or Genuine and I've never had a customer come back to me saying the cable doesn't work.
I did get a batch of cables that didn't stay in the sockets properly, the little metal clips weren't positioned correctly but this was a one off and since then I have received flawless cables.
They don't have an Apple logo on them but do have the USB icon on them, so I can't see how you could call them fake unless they attempt to look like an original. Like I said, if someone asks me I tell them they are copies.