Yah I visit another message board and a big thing at one time was peeps putting their sites on banners. the moderator stopped it, but now it is starting again.
Personally I think it is a real shaddy way of doing things. Having it listed in your profile is good enough. Big frikken Banners, repeated every frikken topic, are uncalled 4 and a waist of bandwidth.
But that is just my $1.75.