I think the two locations were chosen strategically. The first and main priority of the site is to recruit new customers. If people really do have an interest in investing they'll find the IR links.
I know for me it would be a turn off if the company I'm looking to sign up with also tried to push me into investing as well. Plus most casual investors don't really understand pinksheets. Some may say I don't want to sign up for services from a company whose stock only trades at .01/share. This is all IMO.