Yes, people eat Silkies. Many Asian cultures consider them a delicacy and believe their black skin and bones have medicinal value. For the most part, people can't get past the cute and fluffy factor and bring themselves to eat them. However, I can tell you, they taste like chicken.
Really, when you're rehoming a rooster, its best not to think about it after its done. Once he leaves you, its out of your hands. If you don't want him to be eaten, maybe try charging a little more for him. Most folks wont eat a bird they've had to invest a little $$ in. It might take you a little longer to sell him, but it might be worth it in the long run for your peace of mind.
Really, when you're rehoming a rooster, its best not to think about it after its done. Once he leaves you, its out of your hands. If you don't want him to be eaten, maybe try charging a little more for him. Most folks wont eat a bird they've had to invest a little $$ in. It might take you a little longer to sell him, but it might be worth it in the long run for your peace of mind.