The answer is money, revenue, the extra 6 teams means more money, more fans, more jerseys, to sell.
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They were the Pirates from 1925-1930 in the NHL and then the Hornets from 1930-1967 in the AHL until they were added into the NHL in 1967 as the Pittsburgh Penguins. They won Stanley Cups in 1991, 1992, and 2009.
The St.Louis Blues started playing in the NHL in 1967.
1967 along with five other teams which doubled the league's size.
The NHL player who went by the nickname Iron Man is Garry Unger. He played the center position on various teams for 16 seasons from 1967 until he retired in 1983.
The NHL added 6 new teams to start in the 1967/68 season: Los Angeles Kings, Oakland Seals, Philadelphia Flyers, Pittsburgh Penguins, Minnesota North Stars, and the St.Louis Blues.