Their art contests are definitely great competitions, it is definitely great to see it, but it is also limited apply potential as well. How many people could have the talent to join?
Art contest is only one type of advertisement and Roobet company have different marketing types to advertise their business. If you can not join their art contest, you can join other advertising events hosted by Roobet team.
Instead, they went with art contest, because it is a unique approach and not many people do that, which I think should not be really all that great because in the end we are talking about just about same people competing against each other all the time, every single competition.
There are some artists with great art skills and they won many art contests so far but there will be new members in the forum and new artists to join future art contests. There will be new rising stars to take over first positions in future art contests and to win more contests, current best artists in the forum need to sharpen their skills to maintain top positions.
It is not easy for the host to have idea for running a contest and for participants to make their arts for submissions.