In the next few days after the battle of Crestfall Plain, Jack spent his time doing adventure quests, hunting quests, and one Faction Quest. He finally became a Baron after completing that quest. He received 120 merit points, giving him a total of 520 merit points. Just a little bit over the 500 points that were required to become a Baron.
Becoming a Baron did not open the availability to use the Kingdom's facilities, so he did not have an outlet to use the merit points that he had gathered. He was told that he needed to be a Viscount for that. He could have spent his points at Commander Quintus' Training Ground, but he figured he would hang on to the points first. Just in case there was a better use for his points after he became a Viscount.