These plaintiffs are ones that have standing. I can only guess as to why they claimed that each NWS payment causes new damages, maybe to stop defendants from trying to run out the clock on a statute of limitations?
The purchase price is pretty well set in stone ($20 in your example), but who decides on the $1 number? Can it only be the price on the day after the NWS? Or do you get to pick the lowest point in a reasonable time frame after? Or something else?
Naturally. How can one claim damages when they made money?
I haven't seen any pattern of the stock price decreasing at the end of every quarter when the NWS payments have been made so I agree that quantifiable damages aren't available for each NWS payment.
Can't you say the same about pre-NWS shareholders? The presumption is that the shares would be worth what they paid for them if the NWS had never happened, but why is that assumption allowed and not one made by a post-NWS holder?