Football cadence in a noisy stadium

Oklahoma State is playing Iowa State at Iowa State. The crowd is very noisy when OKST is on the field, so the players can not hear the snap count from the quarterback. Usually this leads to a silent count where the offensive players can not anticipate the snap count as they usually do. However, OKST is having the center do a visual snap count. Before he snaps the ball, he sticks his arm straight forward then brings it back and when it gets past his head he snaps the ball. Sometimes he snaps it the first time he does this, sometimes the second, just like a snap count. He his allowed to do this just like he is allowed to point to defenders and make calls. I have never seen this done in the NFL, I wonder if it will catch on.