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Further Understanding of Wash Sale Rules
Disallowed losses due to the wash sale rule are added to the basis of the repurchased shares.  In your example, on day two you paid $0.70 per share. Then the disallowed $0.30 loss from the previous day gets added to the basis, making your total basis $1.00 per share. When you sell at the end of the day for $1.00 per share, your net gain/loss is zero. Furthermore, you can recapture disallowed losses by selling the last lot of ABC, completely divesting yourself of all holdings in ABC for at least 31 days. Even if that last lot was a loss, when taking into account the increased basis from previously disallowed wash sale losses, you can claim the loss fully on this last, non-wash sale.