Because I don't need another phone.
My campus has wireless literally everywhere, so my iPod now doubles as a Calendar, To-Do List, Web Browser, Weather, and Email device, (since I jailbroke it).
It would have been nice to have a 80GB or 160GB iPod Touch, but all in all I have 2,000ish songs on a 16GB touch. I put it on Shuffle almost always, and change up the songs every few days. I rarely notice a difference between shuffling between 16GB of songs (iPod touch) and 100GB+ of songs (my entire library).