As per the affiliate agreement:

We all know that sometimes people sign up as an affiliate solely to get a discount on purchasing a product for themselves. We’ll allow you to get the commission, but only if you’re also going to promote our products. So the deal is: before we pay you commissions on your own purchases, you must generate sales from people other than you, at least equal to those commissions. e.g. if you earn $100 on sales to yourself, we’ll make a payout when you have an additional $100 from other sales.