[cheat-master30]

That's not the greatest idea because many people like to buy vBulletin because it has features they want in the form of modifications. Note all the pre sales questions asking if it can do this or if there is a modification for this purpose or that purpose. All it would do is:

1. Flood pre sales with those questions

2. Not at ALL stop copyright infringement.

Shutting down the guilty sites is preferred, but not greatly feasible if in a country with limited laws so the best way would simply be to find who is supplying the mods from this site to the Warez forums and removing their licenses and permissions to do so. You can only get the mods if you have a license hence if there were less people allowed to download and share the mods by blocking illegal members, that would halt the modification distribution. That would never be stopped by blocking access to forums to guests because it would just annoy those who want to know that third parties are providing and annoy others (like myself sometimes) who want to show people the kinds of add ons without being logged in.