This is a very interesting idea because it drastically lowers the bareer to entry for someone wishing to try A/B testing.

I think business intelligence should be part of any company's core competences, but there is a market for this kind of automation too.

Some more general feedback:

   - big call-to-action link in the middle of the top goes nowhere!
   - better styling everywhere 
   - pricing should fit on one screen!
   - marketing: focus on GET RESULTS, and IMPROVE CONVERSIONS
     and less on the technical side---my guess is that your 
     main customers will be business people not technical folk,
     so talk about the RESULTS and not so much about the tech.
     keywords: ML, OPTIMIZE, BETTER, AUTOMATED, SMART, etc...
   - who are you targeting with this pricing?
     I think if your product really works it is delivering the 
     same value as a full time employee doing A/B testing and
     optimizing the website for you --- so you should charge more.
     Also -- the ppl who are most likely to benefit from this 
     are high traffic websites (1000+ visitors for stat. signif?)
     so you should focus on them as your target market. 
     I think it will be much better to get 2-3 BIG customers than
     chase mom-and-pop and their little website. 
   - maybe have a demo? (tell user to keep reloading a page/iframe)
     so they see the different versions.

On a separate note, I think the notion of an "interactive" sales pitch that is custom generated for the user is interesting in its own right. Check out the link to my book on my hn profile page --- I have little conversation-like bubbles which add a bit of interactivity. This concept could go so much further though... Think "webpage as a conversation."

Good job on the coding. Now go open the right .css file and make your site look pretty ;)