I can't tell you what that little ingredient is which makes that first person want to go on and aggressively do more, and the other person be content to not do that. It's a mystery, but it does happen.

After a year he resigned and moved to New York City to look for a job in broadcast news. Pest control
Only a year later Donaldson was embroiled in another Federal aid scandal. He covered the two major party political conventions in 1968 and in 1969 began anchoring the network's 11:00 pm Saturday and Sunday newscasts.

Samuel Andrew "Sam" Donaldson Jr. (born March 11 1934) is an American reporter and news anchor serving with ABC News from 1967 to the present.