If you didn't know,
This is the point #6 of the Terms of Use wich you accepted when you installed the last patchBLIZZARD MAY SUSPEND, TERMINATE, MODIFY, OR DELETE ANY BNET ACCOUNT OR WORLD OF WARCRAFT ACCOUNT AT ANY TIME FOR ANY REASON OR FOR NO REASON, WITH OR WITHOUT NOTICE TO YOU. For purposes of explanation and not limitation, most account suspensions, terminations and/or deletions are the result of violations of this Terms of Use or the EULA.