I think it is reasonable and understandable if they have to stop this exclusive bitcointalk wager contest because it is clear that the total wagered amount for every round is not that much.
As I remember it correctly, the latest one is the 3rd contest and they have spent $5000+$1500+$1500= $8000 while I think the total wagered amount on all those 3 contests is not even close to $1M.
Means that it is not really profitable for the casino to spend more money on this kind of contest and perhaps they can simply add more onsite contest where all players can participate.
No casino is profitable running BTT exclusive contests lol. These contests are not for profit (at least not for short term direct profit from the contests). BTT has superior SEO opportunities for any crypto based casino, no other crypto forum can match the authenticity and organic buzz which BTT can provide. Consider it as a the collaboration effort with the OG community alongside signature campaigns.
The more efforts one casino will put in, with the long term approach in the mind, the more chances of success are there.
Just my 2 cents.
I know, but casinos must be smart enough especially if they know that running contest in this forum is not for them to make profit.
Smart here is related to how to make what they spend effective as much as possible, not just to waste too much money.
As former active BTT gambling contest participant for years, of course I did enjoy contests in this forum very much because it is basically great chance to make money.

What I wanted to say is that casino need to evaluate what they did so far to think about what to do next that will be much better for both side (BTT members and the casino).