Recuring Monthly Billing Subscription Business Model

My business is a monthly subscription model known as recurring billing with the card not present and for an intangible good.

The core of my business is built on the idea that I have subscribers that I bill monthly, specifically, I hit their credit card. In exchange, they have the right to use my online educational service.  My rate is low, $20 per month.

The metrics on this business:

Bringing in Traffic to my site
SEO success which is SERP and traffic across many keywords and engines
PPC for paid search
Banner Advertising
Email advertising
Newsletters

Conversion Rates and PreSales Engagement
Total Traffic into the site
Traffic into my sales funnel
Traffic that gives an email, that confirms the subscription
Shopping cart abandons
Conversions
Double or triple subscriptions, Annual Prepayment

Retention
Customers with no level of use or engagement - sleepers
Customers with a modest level of use and engagement
High levels of use and engagement
Add a child
Customers that evangelize and recruit: referrers
Credit card declines from expiration, funds not available, cancelled card

Customer Recovery at Quit

Customer Recovery post Quit
Reactivations