The most significant installation that comes to mind is fingerprint room access. I don't have the numbers but the card key system has to be pretty expensive to maintain and it's not particularly secure.
The card key process is so error prone that reception staff rarely ask me any clarifying questions or require me to present an ID before they reissue a card key allowing access to my room.
Reception-less check-in for affinity programs might also be another high value application.
Vanguard (Nigeria)
The Nigerian Tourism Development Corporation (NTDC) has said that biometric system of identification in hotels will go a long way in stemming the increasing rate of criminal activities in the industry.
