Personally, I don't believe they should. The individual gets the exposure more or less.
However, it really does bring a lot of exposure to the project: look at the tower project or the :tardwallpaper: project. All the attention came from the DD, even when it still isn't finished. It really boosted it: after all, a DD is actually a feature.
It does take time to run a project as well. I hate running mine, but it's something I have to do everynoe and then to keep the community. Also, projects that can be finished I think may be alright to feature: an end result really helps the impact on a project.
The project has to be something like th :tower: project or :tardwallpaper:. They have liek, 2000+ emotes (at least mine does. )