It costs 200 caps to "hire" Orris, The King pays you exactly this, leaving no monetary profit from this part of the quest, unless you get the caps from Orris himself.
With an Intelligence of 6 you can accuse Orris of staging the whole incident with the thugs (noting that 4 thugs were "killed" by Orris when he only fired 3 shots), which will branch off into a dialogue option where, if you have a Barter of 50, you can convince him to give you all the caps he has on him (348 caps), threatening to go to the Kings otherwise (which the player ends up doing anyway to continue the quest). This leaves a profit of 148 caps to the player, or a straight profit of 348 if the King gave you money for the quest first.
With a Medicine of 30, you can effectively examine the "dead" thugs bodies.
Killing Orris after talking to him about not killing the thugs will not affect the outcome of the quest.
If you run straight without taking the detour to the left Orris will follow and remark after you get past the 'thugs', that they were harmless and his senses rarely fail him.
Strangely, Orris in his heavy metal armor will always run faster through the detour than a light-armored character with Travel Light. Possibly fixed in v140525 as a character in clothing can always run faster than him.
Attacking any of the thugs pretending to be dead will turn Orris and the thugs hostile (revealing the obvious fact that the thugs were paid by Orris to act hostile). If the player runs and makes Orris follow, the securitrons can attack and kill Orris.
Rarely, a securitron spawns in the alley where Orris "kills" the 4 thugs, this makes killing Orris easier as the securitron will aid you.
ps3 Sometimes the gambler that is talking to Orris when the Courier visits Freeside for the first time will become hostile and pick up Orris's hunting revolver and fight the player. (Also can rarely be sent 10 feet up into the air and stay up there from Orris shooting at the player in the alley) [verified]