For certain milestones they give them out. Like the little girl that was the 2 billionth guest.
LINKAGE (03 May entry)
Excerpt:
Andrae Rivas, the 2006 Disneyland Resort Ambassador, presented Emmalee with a giant golden key and a
lifetime pass to all 11 Disney parks around the world at such distinct locales as Walt Disney World Resort in Florida, Tokyo Disney Resort in Japan, Disneyland Paris Resort in France and Hong Kong Disneyland Resort in China (which opened in September 2005), in addition to Disneyland Resort in southern California. As an added surprise,
the entire family of 10 (Emmalee, her mom and dad, Mike and Michele, five sisters, one brother, plus a baby on the way) also received lifetime passes to Disney parks worldwide.
I don't think you can buy them. But I could've sworn that they offered them during the 80s at one point. Maybe it was just a rumor though, I was still a kid at that point, so I'm not sure...
