There is a strange obsession with the nonshowdown winnings. They are not independent of showdown winnings.
Let's suppose it's the river, you have position, your opponent checks, and you made a low flush with a 4-flush on the board. Most of your opponent's range (80%) consists of weak made hands which will not call a bet. You are not sure whether to bet for value or not. Maybe 10% of the time you will be called by worse, and 10% of the time you will be called by better. This means betting will not have a large effect on your total profit. However, it will have a huge effect on your nonshowdown winnings versus showdown winnings.
If you bet, your opponent folds his weak hands, so you win the current pot in the nonshowdown category 80% of the time (netting perhaps half of that).
If you check behind, those weak hands simply lose at showdown, so you win the current pot in the showdown category against those hands.
So, a marginal play can take money out of the showdown category and put it into the nonshowdown category, or vice versa. Plays which move money into the nonshowdown category are not necessarily good plays, because they simultaneously take money away from your showdown winnings. What determines whether the value bet is correct is whether you will get called 11% by worse and 9% by better, or vice versa, not what the effect is on your red line.
Here is another example: You have the nut low. Your opponent pushes on the river. What's better for your red line, calling or folding? Call so the loss gets moved to the showdown winnings. But if you like money, fold.
How much money would you pay to have a positive red line? Would you be willing to take $30 out of the showdown winnings to increase your nonshowdown winnings by $20? The right focus for me is on winning money, not on having an exciting nonshowdown profit. I think it is a mistake to concentrate on nonshowdown winnings instead of total profit.