The power of the Sat is not the damage, instead, their strength is their ability to disrupt the opposing team and cause initial mass drain. Such drain can quickly shift the balance of an equal fight, perhaps, just enough that the opponent on the sat side can grab crucial reclaim mass in, for example, a navy battle, quickly tilting the tide in their favor, generating a snowball effect.
Simplify the problem:
Say every player has an average of 12 mex
Of these 12 mex, they can be covered with ~8 t3 shield gens
Average cost of shield gens between factions = 3390 mass
8 shield gens x 4 players on opposing team = 24 shield gens required
24 x 3390 = 108,480 mass drain on the opposing team.
Granted, there may be maps where half the shield gens may suffice, thus 54,240 mass drain...
(108,480 + 54,240)/2 = average mass drain of 81,360.
This does not even consider sunk costs to power those shields and more.
So set the price of a sat to be equal to their mass drain on the enemy team, since they are about disruption. A good sat user will find creative ways to overcome this shield counter.
~72k - 81k should be a fine new price.