I'm suggesting a buff on experience and amount of coins from Thieving the Knights of Ardougne as i believe that they're unsatisfactory.
My reason being is that they are too similar too the Guards in EXP and in Profit.

Name: Guard
Level: 45 Edit: (40)
Experience: 312
Item: Gold x50/60

Name: Knight of Ardougne
Level: 55
Experience: 351
Item: Gold x60/90

Guards only require 40 thieving, just an FYI.
Anyways, to my belief the reasoning why they wouldn't offer that much xp and loot is because they are a lower level NPC to steal from, thus fore not requiring must reward from thieving from them whether it be xp or loot.
I don't agree with this simply because it is an NPC that isn't thieved from often at all. You could also go steal from the baker stall or silk stall in Ardouge for my xp PER steal. They require 30 thieving for the baker stall, and 45 thieving for the silk stall.

''Profit'' and Thieving do not go hand in hand in Emps. Heroes can be thieved at 80 thieving, but even at 99 you fail rather often. Wanna know how much money you get from them? 100-250 gp.

IMO the money from every NPC should be incresed.

I don't mind to have a buff on these NPCs because they are worthless anyways even if we receive a little more experience and coins when stealing from them.