I'm expecting that it's probably not going to go much above where it is right now (which is still twice as much as I figured it'd bring in); despite quite a few downloads from HN, no one has paid for it. That said, I'm sure I could increase paid conversions with some work, but I honestly don't care enough to do so. I built this so that I could build neat demos on my iPad, and there's no way I'll recoup the cost of 5 or so hours of dev time I spent on this. I'm just glad that it's working well for people.