What exactly are Master Points for?
It took me a while to figure out that Category and Master Points don't have much to do with assessing the true battle worthiness of a dragon, with the exception of a clear first place with Category 10 (Historic), which with the right elements, is very nice indeed. Second place in combat strength is a tie that goes to Category 5 (some are Epic, some Legend, go figure) and Category 9 (Legend); again, with the right elements.
Unless Categories were removed or made obsolete, this information remains relevant, and so far, battle tested to be true.
Other important data on a dragon is Income, since money is nice to have coming in.
I've seen old posts from 2014-2015 allude to Master Points having something to do with a competition or ranking, and to put high Master Point dragons all together in one habitat? But I couldn't figure out what that was about and the game has changed a lot from then, so it's probably no longer relevant?
[Dragon City Guide - Master Points mentioned](dragoncityguide. net/guides/new-categories/)
[Dragon City Wikia - Master Points mentioned](dragoncity.wikia.
Edit: per forum rules, live links removed.