Google I/O officially sold out in a little more than 20 minutes, Vic Gundotra wrote in a Google+ post. One analyst put the price of each ticket at $900. Servers experienced 6,250 qps load at 7:01 a.m. Overwhelmed with the response, Google will stream the keynote live, along with key sessions. All session videos will become available online within 24 hours. Let's put this in perspective: Elton John's concert sold out in 20 minutes for a hall seating 6,000; all 5,000 tickets for 2011 Apple Worldwide Developer Conference sold out in about 12 hours; and Paul McCartney's concert in Montevideo, Uruguay sold out in 45 minutes -- about 28,000 tickets.