^^
Ive always considered those contests on the Games and Rounds sub-board more as a reward or a way of giving back to loyal players and active forum members to keep them engaged, rather than as a marketing strategy to attract new customers. Thats why how much they spend on them doesnt matter too much. The most important thing is to keep organizing them regularly for as long as possible.
I dont have exact numbers, but how many members participate in these contests, and more importantly, how many of them are first-time participants!
Still, I believe those contests will be very beneficial for the casino in the long term.
Looking at the contests that have been held, the participants are no more than 20, because each round is only 1 page, maybe at the beginning of the contest more people participated but slowly decreased, and only regular participants participated in this contest, so your opinion seems right.
I have tried several times to enter the results of the game but when I saw the multiplier that had been entered, I realized that it was impossible to win, so I gave up on my intention, especially because I was confused about looking for a video replay of the game that had been played.
If we look at several previous casinos that also held contests like this, they didn't last very long, perhaps to avoid participants getting bored so that contests like this were only temporary, or took a break for a while.