At the moment, I'd suppose that sarcastic remarks are only really discouraged in the suggestions forums, and there largely as a reaction to those forums turning pretty combative and inflammatory over the summer -- sometimes in discussions between players and staff, sometimes in discussions between players and other players.
The increasingly hostile atmosphere in those forums is largely what led to the introduction of stricter forum rules for them. (The forum split was a separate, but nearly simultaneous, move made more for the sake of dev convenience and efficiency -- but discouraging combative back-and-forth also helps out the devs by making threads more readable for them.)
The stricter suggestions forum rules may be relaxed again after the month is over, if things have lightened up; but ideally people will use
all of the forums to try and make the server and the community a better place for everyone. Not to put one another down.
Sarcasm and satire
can be used to humorous effect, and that's generally fine; but people can also use them as weapons against their coplayers. As Wyatt says, they can be used to issue "veiled attacks." And, generally speaking, if anything's being used to make someone feel bad out of character, in game or on the forums, I tend to have an issue with it personally. It's not much of a "community" if people are hating on each other, after all.
Regarding moderator presence, we've kept the team fairly small because it was originally experimental, and because nobody wants to see the forums over-policed. But this also means that they can't have eyes everywhere and at all times, correct. They read the forums on their own, sure, but they also rely on forum users to make reports on posts they feel violate forum rules, which they investigate. If they agree with a report, they'll correct the issue; if they don't feel it's a violation, they'll usually close the report with polite feedback to the reporter on why they felt it was not a violation or why they will be taking no further action at this time, etc., etc.
Generally users are only encouraged to open reports on black-and-white rules violations. They
can open reports on "gray area" violations, but I'd ask that they not be upset if their report is closed with no action taken. We're trying to maintain a careful balance between not actively enforcing the forum rules and "cracking down" on them. We want the happy medium in-between those two extremes.
To make a report on a post you feel is a violation, you click the little "!" at the bottom of the questionable post to open the report.
I don't personally think there's a reason to put "don't be sarcastic" in the rules. I think it would lead to over-policing, and usually sarcastic posts that are mean-spirited are already covered under
general forum rules #2 and #3.