Here's your warning: this post may ramble on and include lots of math. It has charts and tables to help.
Now that I've got that out of the way, I thought I'd share with you what seems obvious but might not click until you can actually walk through and visualize it: subscriptions are more powerful to your revenue model than single sales.
I'll say that one more time in case it is revolutionary to some of you: subscriptions are more powerful to your revenue model than single sales.