We see that when they have more events, that means that a big profit is coming into their casino and their gamblers
also enjoy it.
Your thinking is nothing wrong but it's not enough and I would like to contribute one more point. If you see a company becomes more active with marketing by running more marketing programs, contests, you must be carefully on your judgement that their marketing strategy has worked well. It can be their short term overspendings on marketing while effects in return are still unknown.
I don't think casinos with long-standing marketing campaigns can underestimate the results of their strategies. Some have signature campaigns have been running for over five years, along with contest programs and even free bonuses. These brands are the most well-known and their popularity is steadily growing compared to competitors who are still at the beginning of their journey to reach the same level. In a highly competitive market, only the best marketing strategy will determine your position compared to others.
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They can actually see it. For sure they notice that those reputable and successful casino have long running campaigns and consistent promotions done here.
But I think the duration will depends on how their casino would remain profitable. So if they manage to lure more gamblers in their casino the more profitable they are and with that they can sustain everything needed like to sustain their campaign for long term. There are lots of successful casinos in Bitcointalk that's why they should try unique way to promote their site or maybe they became at least be so generous giving bonuses to their gamblers since this could attract lots of people to comeback and play.