Exploitation =/= abuse
While it's not "fair" that they did it, it's completely legal.
unfair =/= abuse
Apparently there is a somewhat ironic definition of the words "exploit" and "abuse" here in the HC community. I say we weren't abusing, because this is how the Merriam-Webster Dictionary defines "abuse":
a : to put to a wrong or improper use <abuse a privilege>
b : to use excessively <abuse alcohol>; also : to use without medical justification <abusing painkillers>
I say we were not improperly or excessively using pig zombies in the nether when they had bonkers exp. Obviously this action was not improper, as these experience levels were set by the HC staff, and we were using them in the same fashion that anyone else uses any other mob. "Excessive" implies more than necessary, and we stayed within the necessary usage - which is the same usage that anyone gets from any mob in HC: to master their combat specs. As our usage was neither improper or excessive, we did not "abuse" the pig zombies that gave crazy high exp.
Further, and ironically, the term "exploit" carries negative connotations. When we hear "exploit" we think about hackers, dupers, cheaters. Let's look at the definition of "exploit":
1: to make productive use of : utilize <exploiting your talents> <exploit your opponent's weakness>
2: to make use of meanly or unfairly for one's own advantage<exploiting migrant farm workers>
We certainly made productive use of said pig zombies. However, when it comes to the "fairness" of our actions, keep in mind: anyone else could have mastered necro and gone to the nether to level on the crazy good pig zombies, they just didn't! We couldn't stop anyone from doing so, and thus gain an unfair advantage, it's just that no one else had gone to the nether yet! This is not any fault or improper action of ours. The situation does seem unfair as no one else can follow in or footsteps as things are currently, but
we did not nerf pig zombies. If things are unfair currently, it is not our fault.
In conclusion our actions should not be considered exploits (in the Herocraft sense of the term), abuses, or unfair in anyway. If the situation is currently unfair, it is not due to our actions.