Why don't you Orks give your souls to Chaos? Think about it this way: Your species is spread throughout the galaxy. If you were to be completely unified, you would have overran the entire galaxy a while ago. A way to unify your species under one banner, you need the unifying force of Chaos Undivided. Imagine it, the gifts of the 4 Chaos Gods making your finest warriors even greater. Your species is formidable and VERY impressive as it is. The Gods can give you even greater power and even greater conquest. Every "WAAGH!" you have ever had will not even come close to what I'm talking about. So how about it? Join us, and we will make you the greatest species in the entire galaxy. All you must do is surrender your souls and your psychic presence in the Warp to Chaos. With our forces combined, no force in the universe would be able to stop us. If you truly love war and conquest so much, then your species and the Forces of Chaos have far more in common than you realize.
Ya daft spiky git! Ya don't get a propa WAAAGH! without da boss punchin' his way to da top! We don't need no Chaos gubbinz to be strong, we iz strong!
Nah, dem Kha-yoz Boyz doesn't know proppa Orky valuez. Dere'z too muckin' about and not enuff WAAAGHin'! Furthermore, dem Kha-yoz Godz are just puny soft gitz! Gork and Mork are gonna stomp'em like poor little Grots any day of da week! Only some Squig-loving humie could take 'em seriouzly.
Wot iz diz I spy 'ere?! A chaos boy tryin' to get us to join 'em for a good figh'? Naa, I don' fink so ye git! Yez only wann' krump us whenz we iz most vulnerable, strategeological dat iz. Com' on boyz, driv' this spiky boy outta 'ere and boot iz lazy arse back to da pits! WAAAAGH!
Given that the Orkoid species are old, very, very old (almost as old as us) and there is absolutely no indication that the Powers of the Warp have ever managed to corrupt them, I have to assume that they are simply incorruptible. Possibly quite literally, as in too simple to corrupt.
Oi, dis git is just tryin to pickin a fight befur da fight starts. Iz got one find to say to a sneaky git like this. Youz ain't got no hat so you ain''t got nuffin to make a deal
If you serve Chaos, their is a possibility to live forever. I mean FOREVER. Let me specify. Serve Chaos, and you have ETERNAL WAR. Never-ending "WAAAAAAGH!!" within the warp. If you love fighting so much, then this is a good deal. The mortal world isn't always going to have people to fight. Someday, everyone will be dead, and one Ork will stand on top a mountain of bones and say "I Win!". But then their would be no more fighting. In the Warp, you could have ETERNAL WAAAAAGH!!!!! Imagine it!! Join us, and you will all be gods!!
You are mistaken, Orks have been corrupted both on purpose or by accident(worshipped a chaos artifact they thought was from G/Morks, or something) It's just that other Orks see chaos orks as unorky, and will fight them, and as there are more regular orks, the others usually get krumped. Usually, it's logical to assume there are Chaos Orks out there. Lorewise, it has happened, I think just old issues of White Dwarf mostly, but I believe that they weren't retconned.
'Rite, ya convinced me ya ain't some gibberin' gretchin. Ya just in need of a propa krumpin'. At 'em boyz, dis one's supposedly dead 'ard! And we can stomp 'im foreva'! WAAAAAGH!
Huh, I was entirely unaware of that. It'd be ...interesting if it was retconned as corrupted Orks are actually a retcon in and of themselves (they are explicitly immune in some very old stuff, probably largely prior to the divorcing of 40K and Fantasy where I believe they remain immune). I have to admit corruptable Orks do make more sense in the context of 40K, with it's different relationship between Reality and The Warp/The Realm of Chaos.