[irrationaljared]

I actually debated this quite a bit and went back and forth on it. I eventually decided that I wanted to keep it as simple as possible and figured that people might have a bunch of people add photos and then they could switch it to view-only to share with other people. Or they could create a copy of the album that they can reorder and delete extraneous photos that they can share in view-only mode.

I'd certainly consider tweaking it, though, to make it possible to share a view-only and collaborative album simultaneously.