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Here's the polite exit route: say "let me give you my card" and once you exchange your cards say "it was good meeting you" and walk away.

Yes, but be cautious. Sometimes you have to talk to them for a bit to get them to care. You'll eventually learn the 'buying signals'.

Yes ... just get a card and go from the people who don't care what you're selling or are trying to sell you on their own stuff!