well, people from the first world developed nations maybe are not being asked! But if you are from south east asia, you will be asked in immigration to show hotel booking confirmation + return flight ticket otherwise immigration won't allow! The first time I visited thai i had hotel booking of the first couple of days also had a return flight ticket as well, but they forced me to book hotel instantly & i did! Its not same for everyone! Apparently passports of different country holds different weight!