I wanted to be a PX so I could experience rush from all sides (rushee, active, disaffiliate) and also so I could get out of rushing for a year!
That wasn't my only reason, thought, but it was one of the benefits. I had no problem remaining unbiased, it was just part of the job and I lived up to my responsibilities of being a neutral person they could go to. Everything was going swimmingly until the girls started snooping through my things one night when I wasn't in my room and they found my SK credit card.
But anyway...