Egin,
There is one neck for the necklace,
Which is also a bit surprising as there is no good anatomical reason to wear only one necklace per neck - many people wear more.
And only two rings for 10 fingers, why is that? <img src="/ubbthreads/images/graemlins/stupid.gif" alt="" />
Well, not all human fingers are good for wearing rings - I wouldn't advise wearing a ring on your thumb... But nevertheless six rings would still make sense to me.
Maybe it would be difficult to show it on paper doll? <img src="/ubbthreads/images/graemlins/think.gif" alt="" />
They do not show jewelry any way in the paper doll system as far as I know. So what's the difference between not showing two rings and four rings? I guess it's just one of those rules that have been adapted long ago and they are here to stay for even longer. <img src="/ubbthreads/images/graemlins/smile.gif" alt="" />
