I've just run into an interesting perverse incentive (which I haven't succumbed to yet, though I'm not ruling out that I may).
Under certain circumstances this goal can provide you with an incentive to derail on other goals: If I have a goal that may derail today that I do not think it is feasible to push out into the future and I can see that my all green goal becomes due tomorrow, if the all green goal has more money riding on it than the goal that would derail today, I might want to let today's goal derail so that I can get the safety buffer that comes with it (even on a no mercy goal this may be true - no mercy is still relatively merciful).
All told, I think I've decided that this goal is annoying me more than it's helping me, so I've just pressed archive. I liked a lot of what it did, but I think it's not quite the right structure.
A thing I've been trying to do recently when advance plannign for this goal which seems generally helpful is to minimize the number of beeminder goals that become due on the same day (regardless of when that day is). I may look into whether it's worth replacing the allgreen goal with a modified one that encourages me to do that.