It's true a single well thought out post will garner more actual responses than multiple posts on the same topic.

Weigh the pros and cons in your OP, try and keep your personal bias outside the equation at least until the last bit where you can spew on your opinion of the subject. Bring a idea forth flesh it out as best as you can try and see how both sides are going to look at the thread and respond and let the discussion flow from there.

You don't see me making 800 threads about bestiaries or Monster AI, I leave them in my signature and even outside of GD I've garnered alot of attention to my ideas. (Good and bad) You need to take it all in stride and avoid just making another topic if your original one falls from the first page. Avoid bumping it and if it continues to trail leave the topic alone everyone has either had their say, or the topic isn't interesting enough to keep peoples attention.

Even if you have multiple threads in the same vien (About instanced content) try not to link them together to avoid people getting upset noticing the link between them.