There were multiple things he tried to achieve at once with this small tactic of his.
First, his offer of 22 silver coins per elemental crystal would be highly profitable to the students and Valkyries, compared to their previous estimation of 10 to 15 silver coins on average.
As such, their opinion about him would change for the better, which was however not really important to Shane, who was done scheming.
Giving everyone benefits would make them more reluctant to demand the elemental and rainbow subterra centipede corpses because their profit from these carcasses had to be divided among all Valkyries and the three students who had fought against them.
As such, their profit from the whole fight would probably be between several hundred gold coins, while it was much higher with Shane's offer.
