Since I'm running CPA I've been stuck in a lot of visits and 0 conversions (-100% ROI). I've tested different geos, niches and offers; and I've been always top bidder. If it is of interest; I'm using MaxBounty offers and Bemob as the tracker.
I received a tip; that I had to do...
Attention: "role based name" email prefixes such as support, webmaster, info, contact, forum, service, affiliate, admin, traffic, partners, marketing, etc., for our member accounts are not permitted. They are acceptable for a vendor listing, but not for the member email. This is due to bulk email processors scrubbing them for delivery due to extremely high bounce rates. Please apply for membership using a personalized email prefix. Something like email@example.com.
If we discover you signed up with a role based name we will give you only one message to change it. After 3 days your account will be removed if the email is not changed.