When a good batsman starts the good bowler will be at his best. The moment the batsman starts hitting him around, the bowling is expected to start getting off mark and if the batsman continues his rampage, then the bowlers variance to his normal bowling will be significantly higher. This can be further proven if bowling variance of the same bowler is checked with other batsmen. Bowling variance is the number and degree of wide balls or width given or inappropriate length. So the rich get richer is an adage that holds.