I have only actually taken a BOB with a rabbit out of MY lines once and it was joyous beyond anything I had felt before, not because she had taken BOB but because of the rabbit itself that had taken it. That rabbit had been dubbed "pet" quality the year before and no one ever imagined she would have taken BOB in her life, not even me for that matter, until I decided to bring her along for the numbers. She was my bottle baby, my pride and joy and for her out of any of the others I had in my barn to have taken a BOB really made my heart soar.
Some people only buy rabbits expecting to win with them at shows when the fact is, Breeders are usually not selling their best rabbits. That does not mean they are selling bad rabbits, only that they have worked hard to get the best and are going to keep the best to continue improving their lines.