Once you're done, play a mission, or teleport to another map stone then head back, and repeat only 5-10 minutes needed to collect all the purple studs.
There are more of them as mentioned before, and are easy to find, provided you have the right characters and/or items. A third is awarded after shooting the five targets in the back of the town, and two more are accessed through a crawlspace near the archery area. Another is located where a red brick used to be (if you completed the quest to get the Mithril Boxing Gloves). One is obtained by having Sam (or another character with the use of the Narya ring or the Mithril Tinderbox) light the four fireplaces around Bree (easy to find). This means one is capable of obtaining at least 100,000-110,000 studs without the use of stud multipliers. Situated in Bree are 10-11 purple studs, which award 10,000 points each, and they are relatively easy to find. However this self-contained village is also one of the easiest areas, if not the easiest one, to amass a healthy amount of studs in a short amount of time.
This small town located just right of Hobbiton (accessible after completing the first mission, 'The Dark Rider') is where one goes to manufacture items using the Mithril Bricks located throughout Middle-Earth to complete various quests for NPCs.
