Planning for WiMAX

Looking at the available plans from Clear, I noticed that they have a 6/0.5 unlimited plan for 'home' usage available for $40 a month and a 4/0.5 unlimited for 'mobile' usage for $50 a month. Not sure if the different listed bandwidths will make a difference, but seeing as the WiMAX receivers are no different in the router as they are in the USB modem, how can they charge me differently for the interface from my chip to my computer (how would they know/why does it matter)? Hopefully, this is simply an advertising gimmick hoping to get corporate users to sign up for the 'Mobile' plan. I am going to confirm that there aren't any arbitrary terms (like "No more than 3 hops in a day") for the 'home' connection in the ToS when you sign up.The ToS on their website doesn't have anything relevant but it indicates that a lot of the terms of the service will be listed on the 'order confirmation'.