I am not sure what the actual cost is, but yeah, it isn't the load that costs with directed energy weapons; It's the capital cost that kills you.
Well...at that point we start getting into James Bondian territory. Sure, anything is possible with enough money thrown at it...but then science sticks its annoying nose in:
Science. If we know the approximate mass of something and its trajectory (among other things more dedicated physics geeks can add in), we can figure out approximately how it is supposed to be moving through space. If we see it correcting its orbit in a manner not consistent with what is expected, we check into it. Enter the Intel spooks, knowing what the stated purpose of the satellite is, and checking whether or not the trajectory is within reasonable parameters (or alternatively, that it isn't reasonable for a satellite of this particular purpose, but very, very reasonable for a satellite of that particular purpose).
And that's before reaching into their pockets and pulling out whatever super space-viewing micro-binoculars the American version of Q whipped up for them.
Edited by aquatus1, 11 April 2013 - 01:21 AM.