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Well, maybe because we spend so much time at Hive. Hahaha... Nah, seriously. I think each person has the ability to realize with a few minutes of conversation whether or not they will connect with another person. You just need to be attentive to the details. And if the other person doesn't talk that much, maybe this is what motivates even more the curiosity of wanting to get to know them, don't you think? But there will still come a time when the detail or details will give the verdict.
I agree, it comes with experience too I suppose, reading the vibe and possible connection.