Here is a chart, one of my sites. Months were from March of 2010 to January of 2012. I didn't keep the chart going because the site leveled out to this day. This was a site billing on a third party biller, switching to merchant account, using whatever techniques I thought appropriate. Notice the few months downward spiral prior to merchant account, this was a dying site.
Now if you think your site might be stuck in stages 7 through 11 and want to step it up, I will certainly, at the very least, give some pointers.
I am at a stage where I have seen the power of billing, and when setup properly, it can literally change your business and your life. Please keep in mind... it is not as simple as setting up a merchant account. It is every facet of billing, re-billing, emailing, what your are selling, how you are selling, what your pages look like, where those pages are located, etc. etc.
I am focusing on everything that relates to those final steps to making the sale. Just wanted to provide a graph of what *YOUR* site sales could look like when done right.
p.s. I'm not talking directly at *YOU*... you as, in general. You are just asking the questions ;)