Maybe Monsanto is as forgiving as you say, but I don't believe it. I think it is a lot more likely that the type of farmers insist on regrowing from their own seed are small independents who are too far in debt to even think about fighting. I think they took the first offer given to them because it was just a smidge under the quote given to them by the lawyer they went to see where they first got a letter from Monsanto.
Monsanto is not stupid, if they ask for too much the people will fight it and go even deeper into debt to pay the lawyer and by the time Monsanto gets their cut of the remaining carcass, they won't even make enough to cover the cost of their own lawyers. But if they make the price just a bit cheaper than the cost of fighting, the victims will hand over every penny that they can squeeze out and then go off to quietly die the slow death left to them in the NDA they had to sign to get the "deal" Monsanto offered.
Or maybe I am just jaded and a giant multinational corporation is doing the right thing for the right reasons and not taking advantage of anyone.