Regarding klicky skin color:
Cachalote, you propose an interesting theory, but I doubt there is much of a cost difference in plastic colors.
How many skin colors are produced by Playmobil anyway? I count three: "white" like most of their klickies, "medium brown" like the Egyptians, and "dark brown" like the Massai Warrior. Are there other shades? Should there be other shades?
I think Playmobil's klickies have become increasingly diverse and accurate as time has passed. In the beginning, the Native Americans were "white" with normal jagged hair so that if one took off their accessories, they looked just like any other klickies. The Native American klickies then became, accurately, "medium brown" with unique hair. Also, look at the Pirates today compared with the early ones. The upcoming Egyptians are certainly not "white" and while the majority of Specials are "white," what about the former Palace Guard (who actually should have been "medium brown," but I digress) and the upcoming Massai Warrior?
These, however, are all historical themes and we need to address the modern themes. Clearly these have become more diverse as time has passed, but perhaps not as diverse as many would wish. I personally see Playmobil moving in a more diverse direction The recent modern families are a good example of this. As Europe and America change, I think Playmobil will also change.
To answer the question why the majority of Playmobil klickies are white, I would say it's because the vast majority of Playmobil buyers and recipients are white.
Regarding Playmobil theme popularity:
I too would really like to know what themes or sets are considered by Playmobil to be "very successful," "moderately successful," "not successful," and "a total flop" for Playmobil.
I was under the impression that the Romans were "very successful," but now it seems they were "not successful." On the other hand, I would think something like the plumber special would be "a total flop," but perhaps it is indeed "very successful." I would also imagine the dinosaurs would be "very successful" because both my wife and I loved dinosaurs as children, but children today are different than they used to be. After all, I used to play "cowboys and Indians" and "knights" all the time when I was younger, but I don't think these games are popular among most children these days.