It's actually been stickied since August 8th, 2006. If people don't read the stickies (or tha AUP), then they can't complain when threads get locked for legitimate reasons.
Quote: "http://forum.thegamecreators.com/?m=forum_view&t=86163&b=25"
This may sound harsh, but it needs to be said. Dealing with posts and emails from people who complain when rules have clearly been breached takes up a ridiculous amount of time. Mods don't have time to monitor every thread, nor should they have to. All mods are normal users who offer up some of their time to keep this place in order.
Many things don't get locked because there isn't the time, or a little leniency has been offered to keep the peace. Right now, there's too many posts suffocating the work that deserves to be here. It's not double standards, it's cleanup time.
Don't be under the impression that this is being done to annoy people; it's quite the opposite. Many people come, and go in a short space of time, leaving a wake of destruction behind them. The majority of dedicated forum users and users of the products understand and appreciate why the forum needs to be cleaned up from time to time.
Finally, there are always discussions happening behind the scenes on how to improve things. Changes take time, and are only implemented when those concerned are happy that they will help not hinder.