Because no single
pillar is
central to Berkshire's success, perhaps no longer even Buffett himself, the company has grown into one of the largest and
most stable businesses in the world.
For instance Thomas (the - other - Thomas) is contributing regularly to events like the GDC (you can watch a free talk on the 5
Pillars and Pitfalls on indie games PR here), the
Central Europe Game Conference (a free talk on PR basics for indies can be found here), or
most recently, Digital Taipei (yes, there are independent studios in Taiwan), are part of that.