You're right, the number of participants are increasing and their artworks are indeed amazing so it's a bit hard now to win. But of course nothing is impossible and if you love what you're doing, you can execute a nice artwork since it's your passion. It would be better to just have less expectation to win so you won't be too affected just incase your artwork is not chosen. But atleast you did your best and you showed your talent.
The growth of art contest is good result for Roobet. More participants means more noise and free advertisement from participants about Roobet. However, they did not abuse participants and it is a win-win cooperation. Roobet will be exposed to more people from artists to cryptocurrency enthusiasts and gamblers. Participants will do have chances to earn great prize from contest and they also will be able to rank up by receiving a lot of merits for their art submissions in contest.
This is a pretty good strategy implemented by Roobet.com to be able to introduce and promote their casino name to a wider audience, not only in this bitcointalk forum.
I always salute them, the team who always give their best for Roobet.com so that it can become what it is today where they are a decent and well-established big casino, even able to compete with some of the big casinos out there.
This is a spectacular contest in my opinion and art is one of the most interested aspects of almost all human beings in all countries.
Even though not everyone can participate in their contest, we can enjoy what is exhibited in this contest.