Be sure to read this:
Just so you don't get a perm. ban.
An alt account I had was flagged and after purchasing 3rd party items, It was promptly suspended. This never happened up until the wintersday jumping puzzle ban hammer.
In a nutshell, your account will be "marked" and any weird fuckeries you do will be easliy decernable and not brushed off as "an accident".
They be watchin you. So be careful.
Also read a this post by Chris Cleary (Game Security Lead):