Yeah, but do you realize that you are the exception and not the norm?
The real exceptions are the ones with massive bot networks. I've seen more than 10,000 accounts with the same URL in their profile.
I was speaking hypothetically about what I would do but I highly doubt theymos would make any changes regarding having alts.
In that hypothetical case, in which I would be the one in charge of the forum, I would put two accounts maximum and for justified cases I could grant more.
That sounds like extra work for Admin.
But this is very hypothetical, let's see how you prevent people from making multiple accounts if they connect with Tor, for example.
That's one of the reasons why account sales aren't banned. It's impossible to check.