All of the above reasons are good enough for me. But there's also the learning of a new skill that gives you immediate feedback (ouch, tongue bite!). The sense of "listening" to the pipe as I smoke and changing my cadence/technique depending on what the pipe/tobacco is telling me.
That's what makes the pipe more appealing to me than other forms of tobacco such as cigars (nothing against them at all, of course, but I prefer those in a social setting went I don't want to have to focus on the technique of smoking a pipe). It's a skill that I imagine one continues to develop over the years as one's taste changes, one acquires new pipes and tobaccos, etc.
And finally, because you can argue over which type of lighter or matches is the best to use with your pipe! Can't do that with cigarettes!