I can copy pretty solid to 20 wpm. Maybe 25 in a contest. In the ARRL DX contest I hears many stations running 30+. I have to copy over and over and over to get their call so I'm slower at QSOs than I would be at say 20 wpm. And as the contest goes on I hear them calling at 30 wpm with no replies. Over and over. Here's the question. Does running 30+ wpm really increase the QSO rate in a contest when you're too fast for 1/3 of the ops on the band?