I would delete my toon when i got bored back in Vanilla. Stated as a pally until 20 or so, deleted and tried a mage until 10 or 15. Then a warlock to mid 30s and finally a warrior, who is still my main. I knew I didn't have to. Not sure why I did. I don't even want to think about how much /played time I wasted instead of keeping them as alts.