0% NET accretive profit - the OP was saying that the invest/return wash doesn't affect prior profitability, just revenue. Obviously, the new profitability inclusive of the new revenue will actually by lower because of the zero margin wash trade.

Depends on when 20 goes in and 20 comes out.

And how inflation and interest are accounted.

Why would you say that? If take cash and buy an asset I haven't lost money.