Not a bad idea!
However, do you mean going back to $10 if I later decide that this strategy is not for me or do you mean going back to $10 in the same session? If you go back to $10 in the same session, your spread has just gone back to 1-10, has it not? It would seem that at least the majority of your bets would need to be $20 with only the occasional $10 to maintain the illusion of this spread.
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