Are those users paying you? That's a ton of users compared to my side project (0 users).
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.
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.