I'm sorry to say it but probably 85-90% of the traffic is because of greed.
All those signature campaigns, giveaways, airdrops some sort of "free money", attract more and more people who have come here to "work hard" and make as more as possible.
I don't disagree that greed is a serious problem.
I think the signature campaigns, giveaways, airdrops, and other similar forms of "free money" happen on this forum because of the traffic it receives, and its popularity. It might be that there is a never ending cycle of high traffic causing "free money" opportunities, causing higher traffic, causing more "free money" opportunities, and so on.