Contact doesn't effect average as much as eye effects OBP. A guy with 100 eye will get on base about .100 points higher than his AVG, and a guy with 0 eye will get on base less than .010 more than his average. So a .280 hitter with 100 Contact/0 Eye will have an OBP about .285. And the same hitter, with zero contact/100 eye might hit .230, but his OBP would be about .330. The higher the OBP, the more opportunites to score. The more opportunites to score, the more runs you'll score.