Well, that'd be the smart thing to do, financially more than anything. But story's more important to me. I want chapters to have an arch. A beginning, middle and end, that you can go through at your own pace without interruption. Doling chunks out piecemeal every x months undermines that, and it also takes away my ability to go back and tweak or completely revise something in the beginning of the chapter to support what happens in the middle or the end. So that's why it's happening this way, and that's why it'll never get released chunked out in bits and pieces.
To me, the end result is what matters, and if there's some horngy grumbling along the way, that's just too bad.