many hotel in the world use a card or key you must place in your room for have electricity.
you can travel and stay in your room all the time, same of a jail ...

ps :
if you can do it, you participate to hotel make up her price (you think nobody show depense and earning on a hotel or over industry ?) or hotel close.
yes you can thinking only of your profit, same of the biggest company in the world who participate to kill all people in the world for make more profit ...