I was looking at some of my old sites in archive.org the other day. Trading sites was fun back then
Of course, so many of them aren't even in the biz any more, but we were such a small community back in the late 90's - before ICQ even - and you'd email someone for a trade. I have zero idea if they were sending traffic to me, if I was sending to them, etc. It was more of a friendly thing to do.
/old folk