Quote Originally Posted by goldsilvy View Post
Your 22 may be a fast trainer, and your 18 may be a slow trainer
This is what until recently have been reflected in the cost. From two players of the same age and skills but different cost, you could expect much faster progress of the more expensive player, and this is basically what you paid for. As the player becomes older, the speed of his training progress slows down, and accordingly his cost decreases.

In my case,new player has lower skills than the older one, so if not for the speed of training, why would he cost more?