This one especially counts in the courting phase of a relationship. The days of playing hard to get are well and truly over. Women just aren't that into chasing game players anymore. These days, many women are learning more and more about their own worth as people, so a man who doesn't respect that by responding accordingly to communication isn't going to get very far at all.
If a woman you like texts you, don't wait several days to text her back. If you like her, text her back as soon as you get a chance. Any other kind of response is game playing and won't be appreciated. Women talk to each other about how great the men they're seeing are because they reply right away. Be one of those guys and you're in with a good chance.