Of course you can ask Raggy! Thank you for your question. The answer is simple: (bad) PvM habbits. In PvM health haggler heals for ~300 more than plunder. Plunder is also possible to get countered which increases the risk of death for the Trader. It's probably worth trying for added pvp damage, I'll try it asap and report back here
PVM:
Executing Nano Program: Improved Health Haggler.
Someone's reflect shield hit you for 7 points of damage.
You were attacked with nanobots for 580 points of energy damage.
You were healed for 1918 points.
Nano program executed successfully.
Effective heal: 1331
Executing Nano Program: Improved Health Plunder.
You were healed for 1039 points.
You hit ICC Peacekeeper Commander with nanobots for 1292 points of energy damage.
Nano program executed successfully.
Effective heal: 1039