Wish they ran more such giveaways in the forum too just like the old days(Guess the slot etc).
As far as I know the manager has statement regarding for not launching that contest back again since maybe they are done with it and they didn't get much traffic from that contest or maybe they create new to enjoy their community. But I guess those contest you mention is really good since you need to pay close attention on those slot games in their site so that you would get the right answer.
That is one of the best contest Roobet launch that's why even by now there are still people discussing about it since maybe they enjoy it very well.
Correct Roobet seems to lessen their way of advertising here in Bitcointalk and not planning to add more anytime in the future as even their Signature campaigns are now running with 10 members from 60 regular members this shows the team is not that having big interest about their events now though the art contests continues but looking at how they marketing way now? maybe after this last event the team will end even that art contest but hoping it will not come as it nourished artists in this forum and even those not so artists now become participants.