When he was released, most 4* monsters didn't have an attack above 1800 and Jerry was common - he was immune to 4* ladybug, which was also common, but weak to the 3* fiend that stole 3* monsters as its effect.
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Atlantean Pikeman and Clown Zombie are both more effective at using Amulet of Ambition.
Also, Jerry Beans Man's DEF is still pitiful even with Amulet. It's not even going to survive a monster that's weak for its Level such as Serpent Night Dragon or Spirit of the Mountain while in Defence.