I'm not solely a "debut" ticket guy but I do think they're cool and as I enjoy picking up a rookie card or two, that joy has translated over into my ticket collecting.
Regular season debuts are often out of my price range but Pro Debuts -- aka Preseason Debuts -- often fall within a range I am comfortable with. Case in point, this sweet LeBron James 2003 Pro Debut Full Ticket. Graded a 3 by PSA, it presents very well and ran me considerably less than his '03 NBA Debut against Sacramento would have.