I use symlinks to have each one of my account folders linked to an AccoutMaster folder; Works great for me.

mklink /d e:\wow\wtf\account\account1 e:\wow\wtf\account\accountmaster
mklink /d e:\wow\wtf\account\account2 e:\wow\wtf\account\accountmaster
mklink /d e:\wow\wtf\account\account3 e:\wow\wtf\account\accountmaster

On remote copies of WoW I use a symlink to one Interface folder so I only have to keep addons updated in one location.