On November 1st ICANN raised their fee from 5 cents to 25 cents for all registrars (on certain domains) to pay for their insane new budget.
While registrars absorbed the 5 cents, GoDaddy has decided to pass long the cost of 25 cents and therefore make 5 cents more per domain. Sounds small but probably will add up over the next hundred thousand domains they sell ($5,000?).
Note that most other registrars have not seperated the ICANN fee and passed it to consumers yet but they might be a trend started I fear.