If you want to get official answers about Ovi publishing please ask the questions at http://wiki.maemo.org/Ovi_Store_publishing

Ovi and maemo.org coexist in our roadmaps, one being the face for "everybody" (default destination) and the other being a place for those willing to get involved in an open source community way.

Now, some OSS projects might be interested getting more exposure by being in Ovi in addition to (and not instead of) maemo.org Downloads.

Just like there might be commercial projects interested in maemo.org releases (in addition to their Ovi releases) in order to get user feedback or other forms of collaboration.

If nobody sees a point in using Ovi for OSS community apps then fair enough and one problem less.