Only users with "x" amount of posts can start thread.

[netblix]

LoL, this mod does exactly what you're asking and much more...

Mod Name: Cyb - Advanced Permissions Based on Post Count

Mod Link: http://www.vbulletin.org/forum/showthread.php?t=201285

Also try searching more mods over vbulletin.org.. tons will satisfy your needs
LMN

[bucks.ie]

Figured out the promotions setting so got this sorted.

http://www.vbulletin.com/docs/html/usergroup_promotions

[bucks.ie]

What would be the easiest way to implement the following.

On my forum i have a classifieds section.

In the "parts for sale" i want to make it so that only members with 25 posts can start a new thread.

Thanks!