I have mixed opinions regarding fan made ages. I suspect that half of them will be of fairly low quality. I suspect less than 5% of them will be anywhere near comparable to the quality of a Cyan made age (probably less than 1% will put it all together, i.e.: great graphics, great music, great puzzles, etc.).
I think it should be a great privilege to have an age you created made available to the general public via the Uru Live servers. I envision something like two levels of approval: 1) shareable only via invitation, and 2) available to all.
It would work something like this:
1) You would create your age however you like. The only way you could share it would be via outside the game means, i.e. you would have to make it available for download. People would still have to be subscribed to Uru Live to play it, but it could only have the local player playing in it, i.e. there would be no way of inviting another player to join you.
2) Once you think your age is good enough you would submit it to Cyan for evaluation. They would give you one of four responses:
A) Doesn't meet the lowest level of required quality. Keep working on it. Perhaps if they had enough time they could give more details about what was wrong, and suggestions on how to fix it. General guidelines would be available on the Uru Live website, so that people would not be wasting Cyan's time with ages that had no possibility of even meeting the lowest level of required quality.
B) Meets basic quality level to be hosted on the Uru Live servers, but only to be shared via invite and/or Relto, i.e. the general public would not know about it without talking to someone who has already been there. No book would be created on your Relto bookshelf for you to return to this age. You would only be able to return via the Nexus. These ages would only be downloaded to your machine when you linked, not when you first started the game.
C) Meets high quality level standard. The age will be scheduled for general release, possibly via a new linking book within the neighborhoods, the City, etc, or a bahro stone in one of the existing Cyan ages. However, this age won't be integrated into the storyline, other than the fact that the book is available (and in the case of a linking book, perhaps it would have a DRC stamp, but it would never be mentioned in any DRC correspondence). There may be some delay before the age becomes available.
D) Meets highest quality level standard. The age will be integrated into the storyline. Cyan might make any modifications to it that they deem necessary for proper integration. Some type of reward (in game and/or out of game) may be offered for such ages. There may be significant delay before the age becomes available.
Any age meeting B,C, or D would require that you sign a release giving Cyan rights to the age, and also guaranteeing that all content (including music) was original without copyright encumberances, etc.