A lot of people experience really unnecessary paranoia about nulled scripts, mainly because they don't realize what a nulled board even is. Nulling just removes the protection a standard licensed forum has. It doesn't make it blatantly obvious that it's nulled on first glance, unless IPB/xF/vB catches wind of your forum and checks to see if it's registered in the database. Normally that's when people freak out. But here's the deal. After they realize your forum isn't legitimate, they can't do anything to you personally (aside from sending you some threatening e-mails which don't really mean anything.) They will, however, ask your host to take down your site and spout out various stupid reasons for them to do so. An on-shore web host like Hostgator will browse through your files, determine they're nulled, delete them and terminate your account. But an off-shore host is not bound by any laws and therefore doesn't need to check your files, because they'll lose a customer and gain nothing. About 10% of off-shore hosts may actually ban your account, but that's highly unlikely. There's literally nothing IPB, XenForo of vBulletin can do to make you shut down your board. The only person that can shut you down is your webhost. And if your webhost is nonchalant, lazy or simply doesn't give a damn if your boards are nulled, you won't go down no matter how big you get.