Another thing I just thought of is that game companies don't really need to purchase Maya Unlimited because games only use polygons. Subdivisions, clothe effects, fluid effects, etc aren't really needed for games. Eveything they need is in Complete. I know you may need an Unlimited copy for an intro animation scene (like the FF series for instance) and cool renders for magizines and the box cover, but that only requires a few Unlimited copies.