The costs of this strategy are hidden in the trading. Every time you trade, you incur a cost. Lets say your brokerage commission is $0 - you still pay the spr

The costs of this strategy are hidden in the trading. Every time you trade, you incur a cost. Lets say your brokerage commission is $0 - you still pay the spread when you trade and taxes when you sell. Fees for this look reasonable, but why not hold VTSAX which holds approximately 3700 stocks at 0.05% (5bp) expense a year.