(Okay the poll thing confused me so I'll just come out and ask and you guys can post your answer and the whys, ifs, buts and what-evers.
In FFXI we were charged an additional fee to have more than one character. Something we all put up with and had to because of the rather idiotic way inventory space was handled. Largely down to certain things not capping and (when I played anyway) huge price hikes on key materials connected with the rather annoying Gobbie-Bag Quests.
Furniture was also expensive and if you were serious about crafting, you never threw any ingredient away since they were either expensive or hard to come by (Bloody Clotts!)
Not to mention the fact that you didn't (or couldn't) just have one job leveled and needed gear, reasonable gear I might add, and of course this also ate up space.
So having a mule or three was the only viable solution for some.
I for one don't want to pay extra for having an extra character, its something I really hope they leave in FFXI.