I'm not sure if there are currently functional sinks (i've only been to red and gold levels at this time), however I think making it possible to use sinks could add something to the game. The ability to washup/rinseoff in public restrooms for people who would like to not 'smell' but fallen on rough times. Or maybe the person who travelled a distance for a job interview, and would like to make a nice impression by not walking in smelling of sweat, and sanity knows what else, by freshing up in the washroom right before the interview.