I am new to the HF bands, and having fun. But I have a question about accepted practices during a DX Pileup. I was listening to a call from Costa Rica yesterday evening. He didn't announce that he was contesting, but he was working the calls as fast as he could. I admired his ability to work as fast as he did. He was near the noise for me, but occasionally up to s9, so I thought I would try. I just couldn't break thru. As I listened, more and more East Coast and Mid West stations started calling. (as time went on, I could hear the callers moving further west ward) I was hearing Strong Calling Signals coming in at my location. Everyone was very anxious to qso, just like me. After a while I realized that I just wasn't able to break the pileup, and propagation was moving west, so I gave up my calling. But I wondered; Is it ever appropriate or acceptable to try to pick off someone who is trying to make the contact ? Meaning, should I ever try to make a call to one of the calling stations, and ask for a quick QSY up or down, for a short QSO, just for me to log ? I realize I would be adding to the unwanted noise on that DX frequency. And, I would be taking the caller away from a potential break thru for him or herself. I guess it would appear selfish of me. Is there an accepted or appropriate method for this ? Or would I just be a _______ ____ _______ ? Thanks.