For the blogging app, the goal is really to encourage daily thinking and writing, not necessarily to create the best source of deep content.

I do think many long articles should actually be short articles, though. You can say a lot in 450 words.

Per-day pricing seems less attractive to me now. I'm starting to think apps should be pay-for-value, not per-per-use. So, I agree that a yearly or monthly licence/subscription might be better.