If you remix, people want to tap into your sound. If you keep that to yourself it makes the sound more special.
TiestoI've always wanted to be a DJ so I could play the music I love for other people. That feeling hasn't changed, but my sets are always evolving. In terms of tailoring to a specific crowd, certainly I do play differently depending on the situation. It's a different feel, for example, in a small club versus a festival.
Tiesto