Ah - no - I wouldn't think someone like Vanguard would forget. I was just highlighting that the "headline cost" number isn't the only cost you should consider.

Guys like Vanguard actually make money on their rebalances because they are so big. And they keep it in-house - avoiding the costs (both explicit and implicit) of outsourcing their flows to other firms. So being large brings economies of scale as well.

EDIT: By "make money" I mean they use their cost-savings to make or beat the benchmark