For mobile hotspot just use wifi tether (once we have root). I don't believe that Sprint has the right to tell me how or where I can use the data I purchased from them (furthermore I believe it's a violation of net neutrality, which isn't law yet, but it will be).
As for the $10 premium data - I'm fine with it. My Sprint plan will still cost half as much as what an iPhone user pays. I don't mind Sprint charging extra if only it means less people will sign up for it and keep the network load down.
Treo 650 -> Blackjack -> Tytn I -> Tytn 2 -> Palm Pre -> Hero -> Evo -> Evo 3D -> Galaxy Nexus -> Galaxy S III