I started to post this in another thread on my phone, but it got, um, longwinded. Anyway, I believe the thought behind this is simply to distribute people and reduce the server stress at launch. I believe this is only temporary, but will probably at the least be the standard for each expansion. It wouldn't be fair for those of us who have been playing loyally for 2 years to have to deal with 90ks because 10,000 people who are sick of WoW decided to try it out and probably won't even stay more than a few months.