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Many people do know think of Limit as a childrens game and don't respect it.

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The biggest-stakes cash game in the world, where some of the top poker pros in the world play, includes limit hold'em but not NL.

Hardly a children's game.

And what D5 says is also true - yet limit has more variance (risk) than NL, due to a number of factors. For new players, limit feels safer.