There are more Russian users on this forum than all the others combined.
If I am not wrong then Turkish local had a good number of users. Maybe LoyceV can confirm it with his stats.
Anyway, I do not think it's none of ours business of who will be in a campaign and who won't be in the same campaign. DarkStar_ is getting paid to this job and let him decide how he wants. I do not see any problem here.
On a side note: I do not think there are many people who would manage a serious campaign like Chipmixer for this long period of time. When there is a position open we see hundreds of application and picking up one or two good users is not an easy job. Chipmixer campaign discovered many talents. Yes there were some discrete incidents of abusing the campaign (for example figmentofuckmyass) but those users were too smart to hide their wrongdoings. DarkStars_'s integrity was no way near to question. No disrespects to yahoo and Hhampuz. They are also the best in the campaigns they manage.