Well all email programs burn out after exposing it to your traffic long enough. email program have a life cycle of about 2 weeks with my traffic before I have to cycle them out. Did coupon bucks for 2 weeks, ratio's started dropping so I put in ther 4 free email personal sites and my sales tripled. Converted better than any other email site I put up, check em out with my ref code:
Coupon Bucks 