Facebook cracking down harder on affiliates, costs are soaring, campaign behavior is erratic.
Traffic costs have increased multiple-fold, while offer payouts remained the same, resulting in thinner and thinner profit margins.
Good offers are increasingly harder to come by, and often come with offer caps.
As traffic source regulations become more strict, non-compliant campaigns are either not approved, or are penalized with higher costs and/or less traffic.
Traffic sources are becoming more skilled at detecting blackhat practices such as account farming, cloaking, iframing, clickjacking.