From our perspective this is a valid statement, however i do not really think it makes a lot of difference in terms of their campaign goals, someone might argue that people tend to read quality posts more , which is both right and false, quality members probably do, but what about the rest? The last fact can be discarded anyway since you don't need to read a post before seeing the signature, so why would they care about quality posts anyway?

Some campaigns do actually care about the forum quality and carefully chose their members and also keeping an eye on them all the time, that is great and all, but how many good members are left out there? There will always be more spots available than what the a few quality members can handle, most members here know nothing about anything so probably it is not that their goal is to spam but that is pretty much all they can actually do anyway.