I've written about bank alts before. We all have them, and we tend to sign on, move stuff in and out of the bank, visit the auction house, then sign out.
I have never seen one that is logged on as much as Hotlunch. She's a Blood Elf in Silvermoon. I'll see her logged on for what seems like hours. She'll be sitting in the AH, or near the mailbox, and I'll go out questing. When I return, she's still there!
The only thing I can figure is whoever is behind Hotlunch has two accounts and it's no big deal to leave her logged on for so long.
In the next few days I'm on a quest to find out who Hotlunch really is.
Stay tuned :)