Person, who like making stuff in Photoshop may not be aware of fact, that certain kind of ppl make free video games. May not be aware, that they have skills to make skin for model or texture. They need information, that skills in photshop can be useful in video game. And they need to be explained that.
You can't make an assumption, that everyone is familiar with game developing process, vocabulary, and so on. That's why I have brought an example above, GNOME.
http://www.gnome.org/get-involved/Moreover, remember, that popularity of project is a factor for modeler/animator/mapper/translator. If guy who can make cool things in Max sees that game has players database=30 ppl, he will skip it.