We have read numerous media articles of spies who are intercepted before they sell their secrets to countries like China, Libya, Iraq and Russia among others. This is called espionage and it is practiced by some countries, individuals and commercial firms. You may also have watched numerous films with a story like that.
Brian Regan was planning to sell his secrets acquired through espionage to a number of countries for $13 million. This never happened because he was caught before implementing his plan.
People caught for espionage and other related crimes usually receive long prison sentences. This is a prove that espionage does not pay.