I figure satellite access is part of the MSP (matrix service provider) package which is generally covered by lifestyle (because book keeping is lame.)
As to why you wouldn't just use it all the time, it's not exactly subtle, easily portable or even necessary outside of specific circumstances. It will give you coverage in a static or dead zone, but won't do too well breaking through jamming. Jamming hits it harder because the signal has to travel into space, so if your sig drops at all, it can't travel far enough to reach the satellite. IRL low orbit is 400km, so you'd need a R9 signal to reach it. Apparently in SR, you only need the 100km range the dish's R8 signal provides. Point is, sat dishes talk to sats, and sats are faaaaar away, so you need every bit of juice to reach it. Even 1 pt of intentional jamming or the unintentional interference of a roof is enough to prevent that.