Crash hunt competition in games and round sections would be an excellent addition. I am sure players would like to play in a casino with such a low house edge. This platform needs a little more exposure all over the forum and the internet as well.
Competition is always nice but I think it should be also available on the site. They can run special bitcointalk competition although I'm not sure if the interest will be good enough. As proven by many other competitions in this forum, the number of participants is not that big. We have so many active members in the gambling board but only few of them are real gamblers who will be willing to participate in such competition. On site promotions/competitions will be a better option to give something back to real players.
There are some genuine gamblers. But if you see people who do not participate in some competitions, there are several reasons for that. Some competitions are too competitive, and others are too complicated to complete. Players are unlikely to test if you put too many restrictions on a competition. The prize pool depends on that as well. For example, you offer a one mBTC prize pool where a player can lose more than that to get a winning result. Since this is a competition, you must give something to bring new players. If two players compete for a 1mBTC prize pool, that's enough for a startup platform. You will have more participants in the next round.