It can be cheaper for people to get to these cities and get accomodation - as well as the millions that live nearby. I did a conference at the Anaheim conventi

It can be cheaper for people to get to these cities and get accomodation - as well as the millions that live nearby. I did a conference at the Anaheim convention center (=Disneyland). Flights to LAX were $200, there was a $10 shuttle from the airport and a line of $50 motels. Then I had to go to Pittsburgh, sounds like a cheap place. But flights were $1000 with a lot less choice (who wants to got to Pittsburgh?). There were only a couple of hotels near the convention center and they were $200/night. Las Vegas is one of the cheapest places in the US to get to and stay at, that's why it's so popular for conferences. Similarly for Amsterdam in Europe.