Once you raise your Activity high enough, your posting delay will be lowered to a tolerable amount. Of course, the smart thing to do would be to use the forum to tell people about your service and to use an irc or chat client, a program like Skype, your own forum or email to communicate with any potential customers. After all, it isn't a good business practice to run your own website while completely piggybacking on a third party forum for communication.