You know, I wonder how much they've earned off the video game industry over the years...
Obviously, not enough to keep them in business,

In the fab business, you need to have lots of capital (to invest in the fab and to sustain environmental liabilities), and lots of volume (so you can spread the capex and overhead).
If you look at the successful chip makers, they are either gorillas, or fab-less (mostly in the US), or in locales where environmental protection is light (the Taiwanese). The rest are specialty fabs (Jazz for example).
The situation is slightly better for analog chip makers where the need to keep up with advancing technology (thus repeated capex) isn't as much.
Most of US chip makers have divested their fabs: AMD, HP/Agilent, Rockwell, ..... Intel is the largest (sole?) exception, owing, I think, to their near monopolistic market positions.