Although I am not confirming that this bot is what it says it is...
It would make sense that sites that sell legit items run large server farms of multi-instance botting by the thousands. Duping aside of course...
However, IP addys or not, I'm sure an admin at B.net would see 1000 connections from the same ISP queue and dequeue at the exact same time.
I forget who I worked with now...maybe Ace or someone...we worked on a VB app called RealmPipe that would pipe a connection to the login realm, then the game realm using winsock controls. This was to allow direct and scripted packet manipulation...
The project came to a halt when we realized that Winsock controls can't manually modify the packet headers
But I know its possible, for a smart man.
---EDIT: AH yes...here it is
Release: RealmPipe v0.1