The majority of the email list ad networks require placement in the top or best position. Many publishers still try to give a middle or lower position ad for a top position price. This is a surefire way to get your list pushed to the bottom of the buyer's list. Never underestimate an ad network's ability to send funds your way. Your job is to figure out how you can get the largest chunk of that pie.
Ad networks have biases towards large lists that perform.
Don't despair if you only have a few thousand members on your list. Instead, focus on driving your membership up into the tens of thousands of members. The reason for this bias is that it's less work to make large buys from one list publisher rather than make 20 buys from smaller list publishers. Here is a more complete list of ad networks you can sign up for. All Rights Reserved Worldwide.