Im ambivalent about multiple characters but I'm leaning toward voting against
it. The reasons are this: i see it as too easy to make a character that can
do certain things well (grinding cash, making reagents, etc) and then
transfering that to the main character. I think that if this feature would
work it should be used to legitimately play another character class and
develop him. But as many have pointed out, it would probably turn out to be
just another set of min-maxing for your "primary" character. In order to
prevent abuse there would have to be HUGE amounts of oversight both by coded
systems and by active admin (as we all know, some cheaters can be very
clever). That is time that could be better used idling, creating auctions of
fabulous magic items, or (GASP) coding.

Im leaning against this idea.