* 1 - 30 posts or less than 14 days membership: You can start a thread only in the Newbie Forum. [1]
* 31 - 300 posts or less than 28 days membership: You can start a thread in the Newbie Forum and everywhere else except for the Main Member Forum.
* 300+ posts and greater than 28 days membership: You become a Senior Member, and can start a thread anywhere including the Main Member Forum.
That’s why.