This is about having only 10 character slots per realm.
Let me list my characters for you:
- Alliance AH Bank Alt
- Horde AH Bank Alt
- Alliance Neutral AH Bank Alt
- Night Elf Rogue
- Draenei Mage
- Draenei Warrior
- Blood Elf Priest
- Tauren Druid
- Name Save Slot #1
- Name Save Slot #2
Husband's best friend doesn't even have any alliance characters, and he still won't have a spot to make a Goblin.
So I think they should bump it up to ~15 characters per realm. Maybe even 20.
Because you can never have enough (pretty) alts.