I don't think it's coincidental at all. In fact, if you think about it, it's actually EXPECTED. WoW, after all, has gone beyond being just a game, it's a virtual world; and, as such, people will create and interact in all sorts of relationships. These relationships are very much human... even Normal.
My mother and both my sisters play wow, not to mention my wife (I'm awash in a sea of virtual oestrogen, but that's another story). Our online relationships are somewhat different, but no more different then if I had a working relationship with one or more of them.
I think this is because WoW has become another way to interact with people. It's not that WoW has some sort of "Power" to bring people together, it's more that people will develop relationships (even romantic ones) wherever they are if given enough time to interact. It has happened over AIM, through message boards, over the phone... hell, even snail mail has had its share of romance.

In short, this kind of thing does not remotely surprise me.