Players are prevented from attacking people substantially stronger than them to protect them from accidentally misclicking themselves into a failed attack attempt. This protection is for the weaker player.
Conversely, players with high power, be that from spending or from dedicated cultivation of their account, should not be punished by being unable to attack people that are viable targets for them in an open PVP battleground, which is why the inverse is not true.
Hope this helps, and have a great day!
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