Sorry but don't blame any user who is talking bad about your service, as a newbie on this forum who is offering a service like this, you should have known that no body will trust neither you nor your service, over the time, there have been alot of scammers who come around this forum and claim to offer services of different sorts, and at the end of the day, they all turn out to be scammers, so as a newbie, you need to take extra measures and go extra miles prove that you and your service are legit, don't expect anyone to contact you privately for any proof of your legitimacy.
Here is a piece of advice, if you are sure that what you are offering is very legitimate, then hire a well known and reputable campaign manager here on the forum to post about your service, the campaign manager will verify that you are legit before accepting to post about your service to his or her audience, this won't cost you much I believe, and you might also get a very good return for your money.
With the number of scams we have encountered in the past it makes sense not to trust newbies who provide offers that are too good to be true.
On the hindsight, if everyone behaves the same way then it will become more difficult for newbie accounts to promote their service.
In this case, the OP has given a 1 month period to use their services which is a huge benefit for site owners.
They should be paying for the service only if they like the service and otherwise they are not required to pay any costs.
OP has provided this flexibility which is a good sign but then coming to their website which OP has provided I can see that the site is not well developed.
It has some content missing and the design is not very professional which is a red flag for me atleast.
All in all, although it's a good offer for casino site owners they should deal with caution.