And also net income.
> just makes the problem worse
Did you skip the part where it’s not a serious cost issue? None of these birds are even close to being propellant restricted.
> These things are not staying up long, and they're staying up shorter and shorter
Because they’re being intentionally deorbited to make room for better birds. They don’t have to be deorbited as quickly as they are. But overwhelming demand makes it a profitable bet.
> it remains to be seen how much money they're willing to put up for it
$70mm per year for 22 birds [1].
[1] https://www.space.com/spacex-starshield-space-force-contract
The cost isn't in paying someone to not use the orbit, it's that the busier a part of space gets, the more expensive it becomes to do collision avoidance and station keeping.
What makes this impossible to calculate is that there's an unknown exponential involved. The more satellites, the more collisions that need avoiding. And the higher the chance that one avoidance will create new future collisions.
At some point the space is simply so busy that collisions can no longer be avoided.
It’s really not impossible to calculate, particularly if you’re trying to cause damage.
The answer is it’s cheaper to shoot down individual satellites than try to create a localized cascade. Kessler cascades propagate too slowly, and degrade too quickly in low orbits, to be useful as a military tactic. In high orbit one could feasibly e.g. deny use of a geostationary band. But again, it’s cheaper to just shoot down each satellite.