I’m not a coding guru, but I know why they do this.
they set via the banner-php a cookie in the visitors browser. means, the Player must accept cookies, if not, the player gets not tracked. But most of the players have cookies enabled, so it works in up to 99% of the cases.
the reason for this way : the want use the fresh and code-free links from the affiliate sites to ultimatebet.com – this are free backlinks to them.
an affiliate link with a redirector do often not give any pagerank value…like
banner-redirect.casinoxyz.com/?affcode=xyz