I always wonder how much Clamp researches about their fans. XD Like, do they ever check out fansites? Look at fanart? Read fanfics? I guess they probably don't have time (or are scared of the bad fanart/fanfics), but they must be a little curious as to what the general thoughts of TRC's fans are. It's probably expected that they don't check out many English sites (and don't speak that much english as stated in Satsuki's column), so they probably didn't have a very good idea what the fans over here were interested in, compared to Japanese fans.
Admittedly, North American fans can be loud when it comes to their fandom. At conventions I've been to, yaoi is HUGE, and many fans are...not so reserved in stating that ^_^;;. You can't go to a Kingdom Hearts/Naruto/Tsubasa cosplay photoshoot without it turning into a mini Yaoi-con. In comparison to Japanese conventions, the fans here are very vocal and active in their yaoi-ness (even though that isn't really a word?). XD
So, Clamp comes over here, has no idea how the fans are going to react, and as soon as the Kurogane/Fai question comes up, everyone goes deaf from the cheering. They were probably taken aback at the time, and remember that question over the others for several reasons. Kuro/Fai seems to be a popular Japanese pairing, as well Korean (going by Satsuki's BL (boylove) comment in one of the other Chipmunk Cheeks articles), but on the opposite side of the planet, the fans feel the same way even if they are quite loud about it.
Umm.... I forgot what my point was. Sorry. XD I'm sure I had one when I started, but then I got sidetracked. Hopefully this is ontopic enough?