Because the wireless Internet access here refers to the 3G wireless Internet access handled by telecom or mobile or Unicom, which is paid according to the size of the traffic, and the broadband Internet access of the wired connection is a monthly unlimited traffic, of course, it is much cheaper.
In addition, 3G wireless Internet access can ensure that you access the Internet anytime and anywhere, operators to achieve this guarantee, must increase a lot of wireless base stations, the inevitable construction cost is greater than the cost of wired.