The plural form ends with a 'z', not an 's', but otherwise fine. If I were you I'd be more embarrassed about misspelling 'spelled'.
Yes, we're all Khanzumerz really, our lives depend on the products and services of companies and corporations, and sometimes they feel that they can get away with anything. And sometimes they do. If I can just step slightly off-topic (I'm sure you won't mind), I'm definitely against materialism and commercialisation. Obviously our culture is based on commerce, and I'm not at all suggesting we all stop being captivated by something on the market every now and then, but it really sickens me the way holidays are converted into, and even created as, selling points. I hate watching children's adverts because now that I'm older and wiser I can see clearly how it's preying off of them. Accident claim policies, I hate them too - "If you've had an accident that isn't your fault, sue someone who's fault it wasn't really either!". Again, I don't know if it's Oddworld that made these views for me, and I don't really like to think that my opinions are actually shaped by anything other than my own judgement, but I'm positive that growing up with Oddworld over the last few impressionable years has helped make me aware of all the nastiness around us, and for that I'm really grateful.