I've only seen it myself once, a little bit more than a few months back, but it still hits me hard, even now.
Young, aspiring artists, like myself, who believes that no one cares about their art. This arises from mainly one cause:
NO ONE COMMENTS OR FAVORITES THEIR ART.
It doesn't matter if you're just an amatuer (again, like myself) or a professional, you want people to recognise your art. For more esteemed artists, it hurts to see people copying their art without their permission, or when people post it online on other sites without crediting his or her specifically. Why?
BECAUSE YOU PUT SO MUCH GODDAMN WORK INTO IT.
I can speak from experience from having this account for almost two years. Not with people copying my art or reposting my art without my permission, but with the lack of comments and favorites.
A good day for me is 1-3 notifications, which usually are favorites. 21 is a whopper. And 75 is a dream that I will probably never see again, even though I know that I'm improving in some aspects (I need to start drawing some original stuff though...I'm working on it).
It's depressing to see that a drawing of mine only receives a handful of favorites, and only one comment. I spent minutes sketching it, but hours shading it until I think it's good enough to post. Even then, I still see flaws. So it becomes depressing to the point that I don't even reply to some of the comments.
Have I considered deleting my account? Yes. So many times that it goes onto the second hand.
Then I, surprisingly enough, consider the more positive things...
I am lucky enough that my drawings have earned me such loyal watchers. Watchers who will favorite and comment on almost everything that I submit, even if they will be the only one who commented. Even if they have no idea where the character if from (I draw a lot of fanart). These are the deviants who brighten up MY day with their support. It pushes me to continue drawing, despite the lack of reception.
The only thing you can do is practice and continue posting your art. If you receive such little reception from your art, do not expect people to reply to your journals which exclaim that you want to quit. Only you can prop yourself up. If you can't handle this sad truth, then find some friend to offer moral support.
DON'T JUST QUIT.
I, personally, do not even know why I'm bothering. But I'm going to post my thoughts anyway.