Stake has their own way to provide contests, as long as I remember they never made any contest in this bitcointalk forum since the first day. They have their own forum and social media, most of their promotions/contests are there not here. Primedice which is the old sister had some contests in this forum long time ago but Stake do not follow. They must have their own reason why they do not provide contest in bitcointalk, so do not hope too much that you will see contests by Stake in this forum.
their is something I want to know is it compulsory or necessary that any signatures campaign launched in this forum most have contests or organised a contests in the forum, I have not seem were it has been written before, I think a signatures having a contests is like another avenue to promotes their products in the forum, unlike roobet signatures they have other things they conduct that got attention of people and with their art contests many people have known them, so stake have the highest numbers of participants in the forum that promotes their signatures, and that's why they don't feel to conduct any contests because contests is as same making themselves to known.
I would guess that you need some sort of goal for the signature to make sense, that way you would be able to redirect people somewhere, otherwise it is just brand awareness and nothing more. If you just write "hey this is stake, play here" and leave, that is not good enough and usually do not end up being great.
But, if you share like some bonus, some promotion, some rewards etc etc, like whatever you can do, then you will realize soon that people will flock better, because there is something to go there, a reason to be there. This is why most campaigns end up having something like that which people can focus on, instead of just general promoting the casino. This is why I believe it should be important to keep having these stuff.