Why are maglev trains still rare?

They were invented decades ago.

They have fewer moving parts than wheelbois.

They require less maintenance.

There's obviously some bottleneck in expanding maglev technology, but what is it?

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Ah thanks for the summary and the links!
- Who are you talking to? OP didn't provide any links...
  
  Sorry, that was supposed to be in response to a reply to one of my comments - my bad!

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