They can't mention other sites because, by the wishes of the Imms, such sites aren't supposed to *exist*. And here's why:

Dioxides is only tolerated because nobody can really do anything about shutting it down, but the VIP staff is very good about respecting the wishes of Imms about what info to show, and to an extent, other players wishes. It has a wealth of decent information regarding an intermediate/advanced gameplay level of discussion but the information in posts aren't always correct save for the policing via extensive flaming and modding that the players do to one another. Quite frankly in many cases they will discuss number crunching that isn't really very helpful to the new guy's success. For example, you only need to know that more weight and a larger size causes you to bash harder for more lag, more accurately etc. and that less weight and a smaller size makes dodge better, but there is no point in trying to find a medium ground for both because you just end up doing poorly at both. Just pick one to be good at for a given situation. Also a newbie doesn't need to know the difference between an average 18 and average 22 weapon, he'll notice the difference in the increasing damage nouns and it doesn't really matter all *that* much whether he's doing an extra 20 points of damage or not that isn't being shown in changes to the damage nouns. If a newbie needs to know whether a flaming bite attack type is all that special compared to a cleave attack type, they should just ask veterans in-game what it's useful for, likely Good/Neutral Tribunal types or Acolytes of the Sun would be most willing to chat about it for a brief time if they aren't busy.

The Diku clan site hands newbies on a silver platter everything and then they forget it a day later and come to rely on the site, and then furthermore end up getting booted off when they don't contribute. Whereas someone who stuck it out, (and admittedly was shown what questions to ask on the newbie channel and enough helpfiles to read that they became reliant on them instead) they would remember practically forever. It cheapens the game experience and the work that has been put into the areas in general to use pre-made maps and item searches. Nowadays nobody ever really finds out everything in the game with other players and their own experimentation and using the spells like 'contact other planes' and such, but what the Imms are trying to say is that anyone who does without these sites is going to end up a much better player for it in general. Better roleplayer, more lethal in PK, etc. It takes a whole lot of time, six months to one or two years in fact, depending on what kind of learner you are and what your talents are in the game for this transformation to happen, but you're better for it in the long run.

I'm sure there's more, but I have to work, and maybe someone can pick up where I left off.