You can have as many alt-accounts as you want, as long as you don't use it to deceive,spam,scam or send unsolicited messages.
Scenario:
Ben will just post in Off Topic Section Only
And if "Ben" is only posting in the off-topic section, he shouldn't be here.
It wont matter unless you spam or post crap, i have seen high ranked members that post mostly on off-topic. You can even scam, it wont matter since you dont get banned in this forum for scamming, so you can do whatever you want but dont spam