Customer came from affiliate – purchased few products with 25% discount code – I guess he found it somethere in Internet (so I couldn’t make any profits because of such combination)

Few days later he made purchase again – and again with discount 25% code. And again I paid 25% affiliate commissions.

Question is: how long to wait till relations between affiliate and customer “wears off”? I wanted to offer special discounts to this customer – but combined with affiliate commission it makes deals non-profitable. It’s not fair to leave good customer w/o special discounts – I guess. Now I’m thinking to either remove affiliate commissions or make them alot less than 25% (like 10 or so) – which is the same thing.