They need reassurance that there is no malicious intent within the smart contracts and that the platform is secure without vulnerabilities that could be exploited by hackers. It is important to know the individuals behind the project, the team that is building it, and the community of users.
thanks for share! some questions...
it's not possible place bet as an exchange (back and lay?) ?
Has the smart contract code been audited by a third party?
It could be possible bet on horse/greyhounds?
Did you plan to perform some promo/giveaways/paid reviews for bitcointalk users?