I'll give all of this a basic summary...just for review.
Thread Necromancy: Contributes to clutter. Users are encouraged to RESTART a thread if they wish to discuss it again. This makes room for new topics to flourish and be found easily and allows older topics to take a rest. Perhaps after a month or more, new perspectives and things can be brought to the subject. That's what makes reviving a thread by starting a new one with the same subject useful. It carries none of the old baggage and ideals of the previous thread, because people can be sheep. If the same thread is recycled over and over again, the answer to it may never change.
Forum Advertising: It's purely and blatantly a STUPID, POINTLESS AND ANNOYING MESSAGE. Affectionately referred to as SPAM. Have a new website? No, we don't care to have our discussion interrupted by your cry for attention. We allow for you to leave a link in your signature yes. That's unintrusive and effective enough. Signatures can be ignored. If you want people to come to your site, sit down with us and chat. Join us, make us want to join your site by letting us get to know you as a good person. Then maybe we'll gladly click that link in your signature to give your site a try. Maybe we'll even be able to become contributing members...it depends on how well you run it.
Most people at PC don't tolerate abusive staff on any site, and that's why they like it HERE! Because for the most part, the staff here typically doesn't abuse anyone who doesn't do SOMETHING to deserve it.