Thank you.
But what about pirate hunting?
If the Kell Hounds / 12th Lyran Regulars (or any other House or mercenary command on pirate hunting duties) jumps into the system where the jumpship of the Skullreapers pirate group is at the nadir point, then this jumpship is not taken?
I'd assume a pirate JumpShip, seeing the arriving signature of another, unplanned JumpShip, would probably kill its station keeping drive, turn off its radios, and thus effectively turn invisible. Per the sensor rules of Strategic Operations p. 117-119, and per the jump point descriptions (p. 134-135), BT's aerospace sensors have much shorter ranges than the size of standard jump points.
The only sensors with useful interplanetary-scale search ranges are:
1) jump signal detectors, which can spot a jump at distance of a billion kilometers or more
2) drive plume detectors, which can spot targets at tens of millions of kilometers on a good roll
Standard jump "points" are just places where the poles of the star intersect the "proximity limit" of the star system, which is the closest point to the star that JumpShips could normally arrive (ignoring pirate points). The entirety of space beyond star systems' proximity limits is open to JumpShips, so zenith/nadir points sort of blur off into an endless volume of valid jump arrival points. The stand out feature of zenith/nadir points is that targeting them is easier than most jump points (see hyperspace travel, Strategic Operations, p. 88).
What I'm getting at: it's unlikely that a half-intelligent pirate ship will be close to detection range at standard jump points.
But for those others who are spotted, yes, it seems likely that Houses and ComStar wouldn't yell too loudly if pirate JumpShips were captured. Just note that boarding actions are challenging without specialized troops and ships. Even a lumbering JumpShip is hard to dock with if it starts rolling and burning.
Or what if the former colony of Star Haven (which dropped of the map in one of the Succession Wars and nobody except the jumpship crew knows where to find them) sends a jumpship to Solaris VII and a Marik raiding force takes this jumpship?
Yes, sending them down to the planet, OK, but how long will House Marik pay their bills?
Probably not long at all.
"Deep Periphery scum? Be glad you're on a planet with atmosphere and fast food."