avghacker
The only advice I can give is that you don't gain anything by taking it down (and it looks like you are gaining traction with almost 3k users). Scale back if you aren't using that $80 to a smaller instance in the cloud. I'm paying $25/mo for mine. If you would rather sell, check out flippa.com
With 3k users, I would stick it out. Maybe ask for feedback, opportunities for growing, etc.
Edit: I see the beta is free.. I would grandfather those people in to a lifetime free plan (as long as they don't cancel) and start charging new users a per monthly price.
https://techcrunch.com/2012/04/24/one-sentence-pitch-winners...
Google: one sentence business pitch
That being said, there's always a chance they could press charges against you for cyber crimes even though your intentions are to help them fix their site.
I've been working on reports for Freshdesk customers. This is my poc, I know it's very ugly, but any feedback is overwhelmingly welcome.
Thanks!