Question - How much climb is there in a typical ride for you?

Answer: I used to think I would Never be able to ride Mt Diablo with ya'll when I read the elevation gains/precent grades you climb until I realized:

Every day just on my commute I climb approx 550' which works out to about 2750' a week. When I take a lunch ride I can add anywhere from 150 to another 300 feet per day on to that. On weekend rides I can add another 500-1500 depending on where I ride that day. But for every climb I get in this town there's a descent!! Oh Yeah!!!

Questions: Who uses 650 tires and why???