He probably is wealthy from the Twitter IPO, but regardless of that travel is not that expensive if you stay away from beachfront suites and luxury events like the Olympics. My roommate spent two months this summer in Europe, and I think he spent something like $6k in total. He just stayed in hostels and traveled by train whenever possible. That's maybe not dirt cheap, but consider that a lot of people in America blow $10k on a one week trip.

The problem for most people on this forum is probably not money--it's time. I'm sure many readers here have $6k to spend on a vacation. How many have two full months off work a year, on top of all the other normal days off and sick time? I'd wager only a very, very small minority, especially among those in the US.