More common and breed faster. Females are more expensive because they deliver the actual eggs and tend to be less common, they also take longer to mature. This varies by market though, for example, in the ball market, a nice 4 gene male is still cheaper than a 4 gene female, you would think he would be more expensive because I could stud that boy up to as many females as I could get out of him, in the retic market, a sweet 3 gene male will bring in as much or more than a 2-3 gene female...I guess retics just make better studs...maybe size really does matter. Tip: try not to buy any expensive hets at a show unless you know the people because sometimes that 50% het pied "accidentally" ends up in a deli cup labeled "100% double het pied & albino". lol.