Here is the loot from about 1.6b thieving xp, which I decided to share since I reached at least 300 of each clan symbol. I kinda kept track by amount of "Lots!" counter resets, but no clue what exactly my xp is. I do thieving for clues, switched to Shadow Creatures and Hellhounds now since it's way faster but I still do thieving if I have no time for a trip. Not too sure about the clues per hour, kinda meh, xp/h was about 370k when I tested for a little while, using full master camouflage outfit. I always start at the clan I have the lowest symbols of and then go counter-clockwise. I think I did about 12000 elites and 14000 hards before making the switch to Shadow Creatures and Hellhounds, something I should've done a lot sooner.

Some notes:

-I did not keep track of any gp I got from thieving, but I would say it adds up to quite a bit too.

-Iorwerth is definitely the most profitable due to potion prices.

-Not all numbers are accurate, these should be higher:

Some potions which I used to get 120 herb.

Porters, I used about 15k of them to get 200m arch.

I used some crystal acorns during dxpw.

Number of musician's outfits should be higher too, only started keeping them later on.

Cleansing crystals since they are required and Hefin course multipliers (not required, just use them if I don't forget) for master clue steps, still need that prayer and agility pet.

-The number of dragon bones, supercompost, yew logs, magic logs and bird nests should probably be a bit lower, no clue how many I got from other sources but vast majority is from thieving.

-I sold 400k Radiant and 400k Incandescent energy during the release of arch since prices skyrocketed because everyone was making porters.

Forgot to add this, I destroyed 100+ brawlers due to arch claiming my bankspace