Unless this is sarcasm, I completely disagree. Listening to thousands of ideas inevitably lowers the value you attach to each one, and lowers the barrier of entry for what ideas you hear.
This is how I exercise that skill. I listen to science, sociology, religion, conspiracy theories, relationship dynamics, etc.
Sometimes, I pick up something. Most of the time I'm allowing the ideas to float around in my head.
It helps a lot to practice this skill, because I trade for a living and I need to be able to convince myself that I am wrong about something all the time.