People who have thousands to drop on f2p and mobile games. People who have thousands to drop on golf, social drinking, and other expensive hobbies.
People love to talk about how expensive XIV is. It's not.
As a hobby, gaming is incredibly cheap. You spend almost nothing.
If I buy 2 Lego sets a year, it's more than I spend on XIV, by a long shot. Especially when it's the bigger sets.