The most I've ever paid for an app is $15 for a highly-featured launcher that is now literally the core element of my phone use. This pricing just does not make sense when compared to the rest of the Android ecosystem.

Additionally, I don't know if I would call it "highly polished." I'd say it looks fine and browsing feels, well, like browsing, but I used it for a couple days and comments seemed to be totally bugged. They were appearing out of order, disappearing seemingly randomly and I think some where even attaching to the wrong parents, because there were things I was reading that just didn't make any sense.