Earlier today I downvoted an answer, then after the OP had edited it I retracted my downvote. In between I had hit the daily rep limit of 215 (including one accept) and now after retracting my downvote I find I have 216 rep for the day.
Obviously the determined gamer's strategy should be to make lots of downvotes early in the day then retract them all at the end of the day :-)