To put this in perspective, 30mA costs about $0.15 / year at typical US electric prices. 500mA is $2.50. A tiny draw regardless, but probably a lot more significant if you're running on batteries.
PS - I know we aren't going to get WiFi for under a few dollars a year. But physical ye-olde switches are vastly under-estimated I feel. In particular a button to put it into "configuration" mode.