At my company we've been looking into this. We've been in contact with a security company who gave us a quote of £6k, for probably what amounts to not much more than just a port scan. We've only got 4 VPSes, so this seems a bit crazy! Keep up the good work, I want this now! :D
(Also the link to your other product http://www.mavitunasecurity.com/netsparker/ doesn't seem to work?)