Would cool to have some kind of free trial. Even if it did something like:

  6 vulnerabilities found

  Wordpress Core vX.x:
   1. CVS0001 - click here to resolve
   2. CVS0002 - click here to resolve
   3. CVS0003 - sign up to resolve

  Wordpress Plugins:
  - W3 Cache vX.x
    1. CVS0004 - click here to resolve

  - Jetpack vX.x
    1. CVS0005 - click here to resolve
    2. CVS0006 - sign up to resolve
 
  - ...

You get two Wordpress core fixes and two plugin fixes for free. The rest you have to pay for.

It would be a good on-boarding process. It get to see that there are indeed vulnerabilities, and I get a few solutions provided for free, but to resolve the rest I need to sign up.

As someone with a single WordPress personal site the starter level is too expensive. Have you considered a per resolution fee? I.e. You find five vulnerabilities with my site. I pay $X.XX per fix?