Not having to run a single wire to a single house...anywhere in the world. They catch up to AT&T's 100+ years in a single day.
First customer = billions.
Second to 100 millionth = pennies
Not in a single day, but in about five years. And more than pennies, but the general point is well made. Ground stations will not be trivial. They still need millions of customers. I'm guessing breakeven, even under the wildest rosey estimates, will be 5-10 million, probably more like the latter.
But there is a wild card. What if there is a special service also, perhaps available only to government, that might bring in some fat cash? What if the US military bought a few thousand stations for land, air and sea? They certainly are looking at commercial aircraft for comms and customer entertainment.