I think if you are going to set up a forum competing with other similarly topiced forums, you need to offer something unique and interesting. With dnforum, you'll be competing with a forum that was there first (the .com syndrome), that has a long standing and loyal membership, and a forum that offers very unique things like its own money system that actually has a real value. Now that's unique and brilliant imo. So you need to overcome time and innovation. It's not impossible, but it would be very difficult and would require a lot of talent and luck and mucho dinero.
But, you might have an easier time if you nichefied your forum a little. Focus on a specific element like new tlds only, or some narrow aspect of domaining, and offer the best and most thorough services for your membership on that aspect. Also, try and offer something no other similar forum has like unique domain lists, tools or innovations like creating your own currency etc..
Whatever you do, it will probably cost some coin and time so plan well.
GL!