You will not catch an experienced and careful jump party.
If you want your jump to work, you assemble on short notice, 50k off plane, in a system that is empty. And the coords are normally 30 k off plane, too. So even if you have a ship F1ed there, you do not know "up/down/left/right" and as a pirate you cannot dock at the buying/selling point most of the time (lawful bases).
Also... seriously: No need to nerf the jump trading. Because... it is so damn annoying that everybody who does it will lose the fun in Disco anyway and stop it. Jumptrading is grind. It carries no rp. It is only better than normal flying when done expertly. Doing it expertly means "working", instead of playing. The jump-donkey ragequits sooner or later even without harrassment because it is unbearable. I guess most of you here have never flown the jumper...
Jump trading will become (or is already) a side line phenomenon that only very few experts will continue using.