I find this clause pretty objectionable:
4.3. Time and Minimum Amount of Payment. Affiliate Fees will be paid and sent out to you within fifteen (15) days of the close of each calendar month, except that, if the total amount due is less than USD$50, the balance will be carried over and added to the next month’s Affiliate Fees until the total amount is more than USD$50. In the event, the balance amount carried over does not total USD$50 within a consecutive three (3) month period, then the amount due will be voided and cancelled, and we may terminate this Agreement.