It is also portfolio help as well for most newbies too. These type of contests are not just for professionals, obviously they will have a bigger chance to win but the entry allows you to do anything you want and enter, you may lose if it is bad but you will not be held back from participating.

This means if you join every single art contest on bitcointalk, and anywhere else that you see in the world, you will always have a goal, not just doing art for doing it is sake, you do it to participate on something which in return means if you join even 2 per month, that is 24 creations per year, which could be very little or a lot depending on how many hours you spend on it, but that is quite good to as a start.

You could also do personal stuff as well between them. If you spent 1000 hours on your first year ever, that is actually a quite good thing for you as a start. So, roobet basically brings people a chance to start while getting checked by others and gets feedback as well.