I have 2 alts one "high level" that I first raised due to boredom (had all 50s) and later used to have a progressive raid and still be able to raid with friends. Atm she's a tad left behind but I started leveling her.
The other alt is on another server only level 25 on main... not in any rush only using him when I'm fed up with people on my server or just want to enjoy being a low level