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Mostly Wheel of Fortune
If you think of the top money making movies of all time, about 7 out of 10 are science fiction. Star Trek was not popular on its first run during the moon landing, but syndication made it one of the most successful TV shows of all time. With personal computers and the internet, science and science fiction has become more popular.
CHiPs was a moderately successful series in "first run", breaking into the season's Top 20 only one season, but had a strong following of Baby-Boomers which kept the show running for 139 episodes over six seasons. The studio, MGM Television, was able to make a great deal of money once the show went into syndication after the 100th episode as it ran in most markets.
some were made of wood, but most of them were starting to be made out of metal
Money Jewelry Car TV
FOX (new episodes, repeats & syndication), Cartoon Network (syndication & repeats of Sunday's new episode on Monday), The CW (syndication), TBS (syndication)
For the Contestants it was Brad Rutter and then Ken Jennings see related links Sony Pictures Television has made the most money for non contestants. Rutter will compete alongside Jennings in a special match against IBM's Watson in 2011.
Probably TV commercials.
Thriller made the most money of Michael Jackson's songs.
Dallas
You are most likely thinking of The Night of the Hunter released in 1955, but widely shown on television in the 60s and even the 70s.
Television shows cost money to be put on the air. Most of them are paid for by advertisements of businesses. If the economy is tight, then the companies won't want to spend too much money on advertising, meaning less money from commercials. Also, if a television show doesn't have that many viewers, they won't be able to stay on the air for very long.