Smokey, if sponsors stopped using cookies and instead "wrote" the affiliate ID onto every page as it loads (PHP can do it, and cgi can do it even faster), it would assure that the code would carry all the way to the end.
They can also use things like php session info to carry it forward.
They can also log and look at things like "suddenly appearing affiliate codes" on the signup page that don't have any other click matched to them.
There are any number of things to do, but before they can happen, the sponsors have to want to make it happen. Honestly, there is no money in it for the sponsors, and in fact some of them that are buying clicks over their affiliates would like lose by paying out the big per signup rates the brag about endlessly.
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