If it made sense it wouldn’t be a superstition. But when you have a 162 game season superstitions add a little much needed flavor.
"In this day and age," Scully said, "I would have started in the seventh inning. 'Hey, call your friends, this guy is pitching a perfect game.' That's a major part of reporting the game now, getting other people to share in the experience. But in those days it was not done. It was a baseball superstition. You didn't speak of a perfect game."Source
There are some superstitions that are deadly: not washing your socks or jock or under-jersey while you’re on a hitting streak, eating the same meal at every meal when you’re on a hitting streak, carrying your bat into Harlem when you’re on a hitting streak, and so on . . .
Baseball probably entertains the most superstitions or, perhaps, compulsions than any other sport. Tapping the plate, hitting the cleats with the bat (even when there is no dirt on them), crotch grabbing, wiping the hand on the blouse (pitchers),rubbing dirt on hands, spitting, etc. And, of course, mentioning a no-hitter is in progress.