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Exposure is one of the main benefits they get from the series of contest they held and once people talk about it their name also brought up then this create demands to them. Not surprise if they are successful because they show that their management is willing to spend a lot of money in marketing so to make sure that their casino exist and brought up a variety of games as well more contest to have fun with.
yes, I think they may also have some kind of bond with bitcointalk, even if just as gratitude
because if it was just for exposure it's much cheaper to buy exposure on google or Facebook nowadays
(even though Facebook and Instagram disallow gambling ads)