Uh, what are you talking about?Nintendo did a lot of buying when they entered.
Nintendo is famous for focusing on inner expansion instead of relying on merges and acquisitions and to prefer to foster a partnership relation with satellite studios which is why it has decades long partnerships with development studios like HAL Laboratory and Intelligent Systems (since the '80s).
Without saying that when Nintendo entered the console business all there was Pong clones and the first consoles with interchangeable software had just released in US then a few years later the Famicom was the first truly mainstream console in the japanese market meanwhile in North America the market collapsed and was revived by Nintendo with the NES.
Since Nintendo entered from the beginning and had a primary role to grow the industry more than "buying" it focused on "building".
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