I've seen two things that prompt this behavior: - Fear of the database. For some folks keeping the logic in the app which is fully under their control is comf

I've seen two things that prompt this behavior: - Fear of the database. For some folks keeping the logic in the app which is fully under their control is comforting. I find this to be common by folks who've been burnt by their db in the past. It's a lot easier to assert (quality) control over your own software. - Difficulty in modeling data. This is more tricky, but IMO separates code monkeys from developers.