Oh yes. Satellite internet service has limits just like cell phone data plans. Movies, Utube videos and file sharing songs (MP3's) will very quickly use up your monthly or daily allotment. We have the 17GB plan with Wildblue and even though we warned our neighbors about videos and file sharing--they bought the cheaper package and didn't lock out those sites so they spend half of each month throttled down to dial-up speed.
Regular surfing doesn't really use that much bandwidth but movies, videos, pictures and music add up very fast.
If you get a good Sprint Signal, you can get a Virgin Mobile Broadband gizmo that has a true unlimited data plan. Also, if you are in an area that Sprint has upgraded to "4G", you can get unlimited data packages from Sprint and I believe Clearwire. Another neighbor recently got the Clear gizmo called a Spot but on the 3G network it has a limit. If/when Sprint gets their version of 4G rolled out here, it's supposed to be "unlimited."
Many internet service providers have a "Fair Use" Policy that they can institute at any time, against anyone so unlimited isn't really unlimited--it's more like "as long as you're not hogging all our lines".