Mejan - I respectfully disagree with your stance - or at least with the way you are framing your arguement. As GD and others have made clear, all greeting is appreciated. However, if Cyan is going to sanction official Greeting - in other words, a sort of offical ambassadorship that kicks in at an explorer's initial entry into the game - then by definition you cannot have the doors wide open. The Guild of Greeters was set up in collaboration with Cyan in order to provide new explorers with a place to go where they can recieve a warm welcome and have their most basic questions answered, as well as to provide ongoing support of explorers as they move throughout the world in deepening their journey. Being properly greeted into the game is a good way of assuring that new explorers' initial experience will be positive (unlike in many other online games) thus increasing the liklihood of converting a new explorer into a bona fide fan, thereby increasing the fan base, thereby increasing the liklihood that the life of LIVE will be a long one.
You are saying that anyone who wants to become a Greeter (capital G) should be made one. I disagree. Since this function is an important one, and there are so many ways in which a new player can be discouraged, it is vital that some sort of official process of selection be put in place. Of course, this process does not necessarily have to be through the Guild of Greeters. However, this Guild has been operational for over 2 years, was officially sanctioned by Cyan for this purpose, and, by the preponderance of reports, has done a great job thus far. Other than creating a NEW Guild, and reinventing the wheel (zero sum gain) or by having Cyan themselves handle the application process (waste of Cyan's time and energy, taking these away from the primary task of providing us with new content, etc.), the GoG represents the most efficient means of recruiting appropriate Greeters officially.
While no application process can be 100% successful 100% of the time, the Guild of Greeters has an application process that has proven quite successful over time. As well, there is a process for handling any complaints that may arise from time to time, seminars, peer guidance, and an official code of conduct. In short, there is process, behavioural guidance, and accountability. This would not be the case in the ad hoc situation you describe.
As noted, many have the qualities of good greetership without being a Greeter. Such qualities as: a sense of responsibility; a fairly deep understanding of the game, its backstory and mechanics; a time commitment; sensitivity to others' cultures, age differences etc.; and, a benignity of purpose and personality proven over time -- these can indeed exist in anyone, greeter or Greeter.
No one who has a preponderance of these qualities, particularly the last one, who wishes to become a Greeter would be denied membership and the decision to apply or not would be strictly up to them. But please admit that not everyone has the time, energy, personality or patience to be a good ambassador for the game. To say that some do and some don't have these qualities is not elitism, it is simply reality - it is simply common sense.
Cyan has hinted that there may be other official guilds as well, and surely there will be some criteria necessary for membership there as well. As much as I would love to create new ages and to become a member of the Guild of Writers, should one become official, at the moment I simply would not have the expertise necessary to contribute much of anything. As you yourself recognize, sometimes it is simply not a good fit.
For the record, I am a member of the Guild of Greeters, but the opinions expressed above are strictly mine and mine alone and do not represent in any way the official stance of the Guild of Greeters on this subject.
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