I find the title kind of exaggerated considering Google I/O sold out in less than an hour.
Not true for all attendees but probably for a good percentage.
In 2009 Google I/O was sold out only after ninety days and Apple’s WWDC was sold out only after more than thirty days. In 2010 both conferences sold out only after a few days.
That both conferences now sell out in substantially less than a day is newsworthy and a grand feat.
http://phandroid.com/2011/01/31/google-io-registration-opens...
2009 sold out in two months
2010 sold out in one week
2011 sold out in half a day.