[Baalz]

Asparas are 3 for 3, Gandhavas are 6 for 18...so they're 3 times as expensive. Quite a difference, particularly as Asparas are generally used in conjunction with other troops, while gandharvas are a big whackin stick nobody else can keep up with so you need to have critical mass of them. Sticking 9 Asparas in to give your markatas a spine is almost an order of magnitude cheaper than summoning 18 gandharvas to smash straight into your opponent's face.