Allow me to (again) quote theymos on this:
I don't have a problem with alt accounts as long as they're not used for evading bans. If you're hesitant to say something controversial because you don't want it to be associated with your name, please create an alt account and say it.
I was just thinking about this quote when I was reading the thread. Originally theymos' quote was referring to that, for example, if you want to express your political ideas and you don't want to do it with your account. This has been generally tolerated in the end, if you want to have two or three accounts and you are able to make money with them as long as you don't break the rules is fine, but it was not the original meaning theymos gave it. Anyway I don't remember anyone getting caught with two or more undeclared alts and not breaking the rules in some way.