"Yesfans is like New York City, YesTalk is like Nantucket."
There once was a site from Nantucket ... ; ]
I agree the biggest factor is the link to YesWorld. Most people stick with the first thing they run across. I actually found Yestalk BEFORE Yesfans, not sure how that happened. But I lurked a bit on both sites before settling on YT. At that time, I just prefered the vibe here. It was more intimate, philosophic, friendly. People sent personal e-mails that have led to on-going friendships outside the board. Chat was great. Then, and now, there is only so much time I am going to spend on any on-line forum, so getting truly entrenched in multiple forums is out of the question for me. Although I check in periodically and post very occaisonally, I am not really a presence in either YF or AGP. If YT disappeared, I would move to AGP over YF.
I agree with Nolan that there is a certain Squire worship element at YF. Musing further, the fact that band members and/or their significant others post on certain forums results in members taking sides and getting involved in band politics. This tends to lead to big bru-ha-has over things that really shouldn't be the concern of fans simply seeking discourse with other people with similar musical tastes and what not. Personally, I find that a turn off. I also think the presence of band members tends to chill honest discussion about the band and its music. To me, these forums are about the music and what that music means to the fans, not about the idolization of band members or the desire to be their best friends.
Having said that, I have met most of the band members and was thrilled to do so. If I were to have any of them as personal friends, it would be Rick because he seems to me to be the most genuine and egoless of the lot. And Jon, who once sat down next to my son, then 16, at an airport and engaged in an earnest discussion about music and angels. But, that is not what I am HERE for. I think fan forums are for fans, not band members. And I feel comfortable saying that here. That's why I am here!