I tested this system extensively. In order to get to the front of the List, a fee of $8.95 was required. Emails were sent to thousands of members, net result zero leads or conversions.
Very easy to earn credits without really viewing offers
Emails from ListJumper are filtered as spam by Gmail
Fee required to adequately use credits
Most offers received are virtually identical
Members/Prospects may be simply viewing for credits as well
For ListJumper