they're nowhere near as good opportunity as that

most teams get around 5-10 corners per game, so 1 in 10 would result in a goal every game or two.

User Posted Link

This link says one goal every 10 games on average - so probably 1 per 50 corners. They are actually easy to defend for a well-organised team - so to concede two in one game is really poor.

Posted By: Mecagoenti, Nov 30, 12:09:43