There are some pets that are out-of-balance.
That isn't to say that they are too powerful but they are too cheap.
But, let's just take a molva at market value. 50-150g, right? max level it and that's a 200-300g pet. Put 100g armor on it. mage kit is 10g...
You're going up against someone who invested 400-500g in his kit and you can cheese in a player structure and make it worthless or less than worthless...