Wikipedia frowns on advertising of any kind. They are an encyclopedia and take their task very seriously. Also, they receive public funding and for that reason they have to abide by some standards. One of them is to not sell ad space (or give it away for free to just certain people. If they do it, they have to do it to ALL web sites that want it).

It's not just EoFF. You will notice that even though I wrote a sizable part of the FFX section I wasn't allowed to put my own site in the links on the FFX pages.