Halfmoons are expensive because they are the most in demand show fish. More HMs are shown and bred than other fin types. Also they are somewhat difficult to raise (believe me on that.... their fins never want to stay perfect).
Who am I? Well I am a Junior Member of the International Betta Congress and a breeder of white HMPKs, red dragon HMPKs, black/red dragon HMPKs, metallic multi HMPKs, blue masked HMPKs, and now multi color HMs. Soon to add black HMs. I will be showing in New Breeder class in fall of 2012.