Another reason is that mobile network operators have been desperate for 3G licenses, banking on them as a key part of their future. With many mobile operators clamoring for spectrum, it's no surprise that good old supply and demand reared its ugly head and sent prices skyward. In September 2006, the FCC raked in $13.7 billion in 3G and other licenses, which far exceeded the minimum-hoped-for figure of $7 billion.
To date, companies bidding on WiMax are generally smaller players with smaller bank accounts. With the exception of Sprint in the United States, none of the major operators has made a serious push for WiMax licenses. That could very well change depending on the success of Sprint's first two WiMax markets, set to launch in Washington, D.C., and Baltimore later this year.
As regulators across the world -- most notably in Europe -- begin to make more spectrum available, the price per MHz per population will certainly climb. Hopefully it won't reach the scale that 3G licenses have.