Put yourself in the mind of a downloader, knowing that uploaders may change filehost at any moment, filehosts may disappear etc, if you have been a downloader for the past 5 years you've seen filehosts and uploaders come and go, most users will sign up then instantly cancel their membership as there's no real bonus in keeping your rebill on. Personally if i was a downloader i'd do the same thing, whats the point of having a rebill subscription if you have these things to think about:
1. Will the uploader continue to use same host?
2. Will i need to subscribe more then 1 time to download the stuff i need?
3. Re-subscribing to the filehost costs the same as being automatically rebilled, it's safer to just cancel and rebill when i feel like downloading again.
Now here's the thing, most people DO sign up again after their period is over, the problem is if you are posting on big public forums or your userbase is using "Jdownloader" or other software, they are being actively promoted to upgrade to premium through various other links giving the re-subscription to another user.
Did you know that Jdownloader will automatically detect when your premium has ended and offer you to re-subscribe over their own UI? Well if you do resubscribe through the program the sale goes to the developer of Jdownloader, these people ain't stupid.
I'm not here to protect K2S i'm just posting some obvious facts, put yourself in the downloaders mind and you'll realize soon enough that having an active rebill isn't worth anything to you.
Also you have to consider some rebills are lost based on payment processor issues.