In doing my month-end reports, and this thread also prompted me to look at things a little more closely, I discovered I have about $700 tied up in seven adult affiliate programs that haven’t sold well for me.
If you use Stats, click the “all time” tab or “last year” and have a look for programs where you may have money trapped because you haven’t reached the minimum. If it’s substantial, it may be worth putting up some banners or posts to get a couple more sales and have that money on its way to you.