Maybe their making you wait 15 more days?
"We pay you in terms of Net 45. This gives us a 45 day buffer to allow for collection from our advertisers. You will receive payment 45 days after the close of your FIRST pay period. All subsequent checks will be paid once per month for the pay period ending 45 days earlier. This is known as Net 45, and is a standard business practice. You will only be sent a check if your account balance meets the minimum you selected when you signed up. Payment will be carried over from month to month until your account has accrued at least your minimum."