depends on retention, if its at 60%, i would figure it like this.. wont be 100% accurate but will give you a general idea.
month 1: 100 signups
$2,000
month 2: 60 rebills @ 60% retention
$1,200
month 3: 36 rebills @ 60% retention
$720
month 4: 21 rebills @ 60%
$420
and so on... but this would hafta be a steady rebill % to be true
im probably totally wrong, but figured id throw in my
