The crash of bat smiting ball: the sound of the six. Go to any T20 match, and you won’t be without it for long. Yet what is bad for bowlers’ figures on the field bodes well for their salaries off the pitch. The reason is one of simple economics. Never have there been more reliable six-hitters in the world. But as run rates have soared, bowlers who can prevent such bedlam unfolding have become scarcer – and so more crucial to T20 teams.