Randomized Spawnpoints would help, but if PS wanted to be really different and \"nip\" this kind of thing here is my idea.  I propose a timer.   Once you kill \"powerful enemy A\"  you have to wait \"X\" hours to do it again, that way everyone gets a turn, there is no camping and those previously commiting those acts will either stop or leave PS.  Either way the community wins.  

The only drawback to this is trying to keep the code for this kind of thing from being buggy,  I can only imagine someone screaming \"I waited 3 hours for this thing and It told me that I can\'t kill it!!\"