Why Do You Think Crystal Kay Doesn't Chart Well?

[Impracticable]

She's probably to exotic for a market like the Japanese. Being that most of the citizens in Japan are Japanese it would be hard for a half African/Half Korean singer to really do to good. Her voice and looks are very different than what most of the Japanese might expect, or accept, for that matter.

I think, due to the circumstances, she does quite well.

But this is all my opinion. I could be 100% wrong for all I know. XD