Back in 2008 I posted my ListJoe downline (levels 1 - 10) was at a total of 504 members. Without actively advertising it for two years, I've still received commissions, and my downline has actually grown! Today my total downline (levels 1 - 10) sits at 650 members!
ListJoe is one of the most responsive list builders I've used. If you haven't already, take a look at this credit-based program to help you build your list. And make sure you take a good look at the offer to upgrade. Upgrading is definitely the way to go if you can afford it because it will save you time by letting you reach more members with your ListJoe mailings!