When I started multiboxing I made 4 trial accounts on wow-europe.com and upgraded to standard. Had to wait 5-6 days and 3 phonecalls before they upgraded. And then I wanted burning crusade but I couldn't upgrade it via the website, so I tried calling them but the phone system was fubar.

So I just went to a website and bought 4 BC keys online, had them within an hour. Cheaper then Blizzard.