With the example of Tolkachev, the book glosses over the fact that the spy is willing to give up some very confidential secrets of his homeland, granted he gets millions of dollars from a foreign government in return. The question I was thinking was, "how much money would it take me to betray my country?". It would have to be a lot of money, sure, but I might draw the line at where my country would not save me for the same amount of money in, say, a hostage situation.