Only top and famous games sells millions.
All other - not so much. but they sells for years, unlike consoles, that make it so attractive to publishers. Games became "collectable" items on PC and you can sell them forever at almost zero cost.
"Wide appeal" is what PCMR wants to belive. They dont want even aknowledge that PC is still widely a geeek platform (though there are now more geeks that before) and still far from mass market.