Yes. But don't monetize public wlan access. It will lead to people not using it. So save yourself the money. Also, by definition you don't provide a public wlan accesss anymore.
I have come across many hotels/restaurants/whatever to tell you that this is cancer. I don't even try to use any public wlan anymore. In my own country I have cell coverage, abroad free roaming (at least in Europe).
The idea came from a client insisting on trying a WiFi marketing cancer known as "TurnStyle". Looking for an altenative to get a simple marketing message across without all the "conect w FB, Google Analytics, ad-laiden captive portal BS" that's out there now.
Fortunately for users, Yelp aquired TurnStyle so it's only uphill from here! /s
