The orbital decay of satellites can take quite a while. It might cost a few hundred thousand dollars to put a satellite in orbit, but it’ll stay there for at least a year with minimal cost/effort. Putting a plan in the air has a constant ongoing cost via fuel, and eventual wear and tear on the plain.
To explain it like you’re 5, building a house out of bricks costs a lot of money, but the house lasts a VERY long time. Building a house out of sugar cubes would be very cheap, but you have to rebuild every time it rains.
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