Well, the phrase is "Lead by example." If your leader is taking far far more than he by any right should, doesn't that give the example that overreaching what is reasonable is valued by the culture? Greed, for lack of a better term, is good?
Also, generally, when these lower level production employees run a scam, like this one, some people go to jail, a few million are lost, and life moves on. When CEO's do it, millions of people can lose their jobs (like Enron for instance), and a ripple effect happens through the economy. Sure, I have a hangnail, better get that addressed before this sucking chest wound.