When you use software to spam links, you’re getting links from one type of site, whether it’s vBulletin, WordPress, PHPbb, or whatever the latest software spam tool is spamming. With this type of link building your links are extremely easy to find and devalue, they’re all coming from the same type of site! If every single one of your links comes from a url with member.php?u=82840, you’re spamming vBulletin, plain and simple. Without any type of link diversity, you’re links are easy to find and devalue.