Is there any good reason to not roll a new toon for each class?

[tymora]

1. Convenience. No hassle to switch jobs for an event (just click one button compared to log out/in)
2. Achievements
3. I am my character. My character is me. One-One relationship -> People remember me better.
When I see a new alt, first thing I ask is "who is this". 1 week later, I ask again "who is this again?".