If people on my Friend's List need co-op support with a new character (or whatever), I tend to have a number of characters in reserve that I can use. The result is that I do have rather a lot of characters on my "save". I created a few new ones a while ago to assist with friend's new characters. Those I got to Lv 5 having pretty much just arrived in Liarsberg.
I sometimes start a new character just for some light relief from the rigors of working on higher level characters!