Work-around is to have the referred customer sign-up for a free account (induce him with some value added benefit). Database the sign-up with the affiliates referral ID.
Then if, and only if, he logs in to make a buy the referrer would get paid.
The other thing would be to ban tor, (real IPs), and then database a browser fingerprint -- but that fingerprint is hypothetically only 65% to 85% accurate maybe. You would have to purge the old fingerprints after 15 days if unseen to conserve database resources.
Bottom line: cookies are only 70% affective globally maybe and cookie slippage is a big moneymaker for sponsors so they have little motivation do try to remedy the issue.
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