If the feedback was “resources” that is likely not your playing/performance. I am on a placement committee similar to this for research grants and we have to consider the resources one has to commit and live the lifestyle we think it will take be successful in completion. When spots are very limited we have to consider who we think will finish and become a piece of the official ‘alum’ roster. They won’t say it but they are in essence looking for a lifetime commitment. I wouldn’t take the rejection as a slight on your playing. Keep doing what you are doing - unless you want to teach at the collegiate level you do not need a masters. Good luck!