Let me explain just one scenario supporting blizzard.
You xfer for a "raid spot". You then sell 1mil gold/buy cheap matts/mounts/pets/wtfever you want, then complain that your raid spot was taken and get a free transfer back after having sold your gold/bought cheap etc etc etc etc
You see the problem? They'd basically having people transferring, buy/selling shit and then crying for free transfers all the time.
Next time either don't xfer, or have a backup plan.
Best of luck, hope that wasn't your grocery money