Please use it on your small site with no traffic for free.
My biggest hope is for a large number of sites to use this.
I've been operating Remarkbox for the last 5 years.
Plan is to grow and try not to burn a bunch of money.
Fallback plan is open sourcing the codebase.
I think the main concern for would-be user websites is not the code, but what happens to all of the comments if you shut down.
Worst-case one might not notice you plan to shut down before you turn off the servers and all comments are lost.
Do you offer downloads of comment archives for user websites so that they can download the comments in a convenient format for backup?
That would be a relief for some people to have mayhaps.
Edit: I see that this has been addressed already and indeed you do offer that. Excellent!
I will set it up this weekend and see how it goes.
But now it's also hopefully going to be a utility people can count on.