I suppose in some sense it gets back to what sustainability means.
Does sustainability mean that you have enough revenue coming in to make sure that everything's maintained and operated? Is that the only model of sustainability that one has? Some would say that's a financial model of sustainability.
I think the other thing is that, when you look at it as part of the community or the region's infrastructure and how that fits in, you might get a different way of looking at sustainability. If you just say, “Here's a dock. Here's a wharf. Do you have enough users and revenue to keep it going?”, if that's the approach, we're probably going to say that there are a lot of places that aren't sustainable.