A whitepaper and cost model produced with the help of consulting group Wireless 20/20 reaches the clear conclusion that MNOs will end up buying extra WiFi capacity from ISPs on a pay-as-you-go basis. They will be motivated because the cost will be so much less than building the extra capacity themselves. One particular bandwidth exchange, BandwidthX is the focus of the report, as it provides a marketplace to bring what it calls Dark WiFi from ISPs to MNOs. Companies with access to unused WiFi, usually in the form of homespots or the spare capacity in amenity WiFi hotspots, can use the marketplace to connect with those MNOs who need extra capacity. Both buyer and seller enter a number of criteria…