Yes, any appreciation is better than none. Take me for example. I've taken part in every RooBet art contest, and I've never won a single prize. But the process of creating something which can be called "art" is so pleasant that I participate in another contest, and then in another one. Now I know from my past experience that getting any money prize is highly unlikely for me, so I'm saying to my wife "I hope to earn some merit with it, at least". And I mean it. I value merits a lot, and I feel really happy when getting them. 
I have also learned graphic designing a little but have not participated in roobet art contests but planning on for the upcoming one.Whenever i create something it gives me immense feeling of joy but the more happiness comes whenever someone appreciate it in any format whether merit on forum or other way in personal.You should definitely participate in the upcoming ones. From my experience, and I was carefully examining every entry in each Roobet Art Contest, professionally made artworks always have good chances of winning a prize(or even two). That doesn't imply that complete amateurs like myself shouldn't try to participate, though. I believe some times it's enough to just make the grand jury smile with your work, and the prize is yours.
Now I'm intrigued to see your art submission to the contest. Hope we'll have another one soon.