Howie, we do that as a perk of membership within SCI. Since we are not in a promotion business, rather an organization that relies upon membership to function, we keep perks for members, that is the only reason.
The Reading Room is an official function of the SCI Librarian/Museum Director. It is where he posts all printed materials that are in the SCI library. The Sites of Interest are external sites outside of the SCI official site. Thus, they are two completely different things; not at all confusing. Good Luck! -Casey