Sorry man, there really isn't a place on the forums for you to advertise a bet server. The closest place would be the Events Forum, but as you can read its not allowed by this rule:
5. Events board is not a cheap alternative for broadcast.
If you wish to advertise in-game events, make a thread that meets certain standards and let it be continuous event, not just a one time thing.
Now you might be reading this and saying "but this is a continuous event", but thats not the case. Bet servers are not recognized as an event, just a form of gambling and a possible way for the host to make profit. For it to be considered an event the host must not make profit on it, this is against the rules. Next there must be some type of prize for the winner. By these standards a bet server like you're doing would not be considered an event.
If you want to advertise a bet server then you have to pay for a global each time you want people to come. A global message cost 10k each time you want to send one and can be accessed from
here.
In the future if you have a quick question like this I would suggest going to the IRC and hopping into the support channel. You can get a much faster response there from either a staff member or a well informed member of the community.
Last edited by Kohta; May 25, 2016 at 06:25 AM.