Most PTC sites have such a section and it may not be useful to the forum but to members it can be. It was my suggestion and one may agree to disagree.
This is a forum and is for discussion, not a PTC/PTW/etc... site.(no offence).
As I have said in my post, oy spambots can benefit from it. Members who manually posts barely gets traffics unless users go through all threads which is very unusual. It will be hard to moderate too. If it isn't moderated, chance for double posts are very high. There is nothing for forum and members to gain from it.
-snip-
People who want to advertise their referral link should make a choice whether they need a paid sig in their signature or referral link. Their choice.
What kind of website's referral are you talking about? I think that the games and rounds section would be appropriate for most websites. You could start a topic dedicated to referrals specifically.
It's against forum rule to start a thread solely to advertise referral link.