So, the results are in, and everybody is a winner! :P
7500 points to each entry.
That's very nice of you, although doesn't it seem a little unfair on the overall winner (who now gets less points than expected). If you can afford to donate extra points, why not use them to boost the other prizes, as 10,000 is especially valuable due to its ability to be redeemed for cash.
Just my 2 cents anyway, after all they're your points.