butterfly options

why can't i buy a butterfly spread 2DTE with wings of .30 delta and every time the trades gets closer to the wings i extend the wings to that side and close the profitable wing ? like that I'm gonna end up in the money no ?
 
why can't i buy a butterfly spread 2DTE with wings of .30 delta and every time the trades gets closer to the wings i extend the wings to that side and close the profitable wing ? like that I'm gonna end up in the money no ?

Backtest a couple years and see what you come up with.
 
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