The bazaar development model turns out to be amazingly versatile: it seems that most software, even things you wouldn't think would be feasible, can be developed using such an approach. But there has to be some working core software before the community will have enough interest to contribute to a project, and there are some projects where that is really too much work for one person to do.
One such area is sophisticated 3D graphics applications, like Blender (and also Computer Aided Design applications, like BRL-CAD). Such projects typically need some sort of seed project in a "cathedral" mode in order to get started. Other projects, such as creative endeavors, are simply not going to be as successful in the committee atmosphere of a community-driven project.
In such cases, there's a need to simply accumulate capital and pay people for their work. But surely this is impractical for a loosely-bound group like the free culture community? Let's look for some counter-examples.