[graeme]

I can think of two good reasons:

  1. A Geico sale is worth a lot more than a fruit of the loom sale.
  2. Geico is something that almost anyone visiting the site might use. Most Berkeshire Hatheway visitors own cars and need insurance.

One of the main links is a message from Buffet recommending Geico and Borsheims Jewelry. Jewelry fits the same bill: expensive, and widely purchased.

http://www.berkshirehathaway.com/message.html

[titanomachy]

Notably, Borsheim's also operates the type of business where you could conceivably pick up the phone and order immediately upon reading Buffett's recommendation.