Why would you tell everyone you have a pirated versioN?
More often than not, people admitting to piracy on websites like the Nexus don't really understand what they're actually doing (pirates don't really bring the kind of stuff up), that what they're doing is often immoral and in some places illegal (whether or not it is or not legal/moral or should be is beyond the scope of my post and furthermore, it's beyond that same scope to pass judgment on the OP or anyone else for that matter). This brings me to my personal reasoning as to why it's just ridiculous to insta-ban over piracy and console modding topics.
In the case of console modding, as I've seen, people have been banned for asking about how to download mods from wherever to upload to their PS360 system, of course sometimes they don't mean hardware modding as such rules get enforced are defining it as. What they do mean is simply what they're asking, to which it should be better responded to that neither the PlayStation 3 nor the Xbox 360 are currently capable of mods.
In the case of piracy, is as I just previously mentioned - such people don't know any better. It's not that they know that piracy or the sort is against the rules themselves, but they don't know that they are usually pirating. Many of the piracy-related bans I've noticed at Nexus and similar websites tend to consist of someone just asking how they can download/torrent Skyrim.