How about a reward for submitting correct answers in exercises.
Nothing more frustrating than failing an exercise when you know one of your answers should have been accepted. How about some recognition when you submit an answer that should be accepted and Duo agrees; a lingot or two perhaps?
That might be counterproductive though if people have a strong personal incentive rather than altruistic incentive they may be more likely to file a lot of bad reports for the off chance of a reward.
Fair point, how about you lose a lingot if you submit one and the owl doesn't agree? just think there should be some payback if you fail an exercise when perhaps you shouldn't have done.
I'm not sure that losing a lingot is fair. I've had a few times where I've submitted an answer sure that I was right only to find out later that there's a slight nuance in the language that makes my answer mean something else. If I can lose lingots because of that, I might be more reluctant to submit answers. I've even had times where I'm quite sure that I'm right and there are even many people in the comments agreeing that it's a correct answer, but for whatever reason over a month later Duolingo still doesn't accept the answer. Would I lose a lingot for that? While it seems like a good idea in theory, I think that losing a lingot for that would just make people reluctant to submit correct answers, and I think it's better for Duolingo to have to sift through a lot of incorrect answers then for them to be missing a lot of correct answers.