No, I didn't forget that option, I intentionally left it out.
This way, a choice is forced. If there was a 50/50 choice, I think 90% of the people here would have chosen it because they THINK they are buyers as well as they are sellers.
The poll would have no value in that case.
I know most people over here would like to profile themselves as 50/50 guys (and gals) but in fact most of them are sellers. (When you buy a domainname for <$5 every now and then, I won't consider that a serious buyer.)
Tino